登录系统后可以清楚地看到大量可用的升级：
258个软件包可以更新。 117 个更新是安全更新。
输出sudo apt full-upgrade证实了这一点：
正在读取软件包列表...完成 构建依赖关系树 正在读取状态信息...完成 计算升级...完成 以下软件包已自动安装并且不再需要： libllvm3.8 libllvm3.8:i386 libmircommon5 linux-headers-4.4.0-65 linux-headers-4.4.0-65-通用 linux-headers-4.4.0-66 linux-headers-4.4.0-66-通用 linux-headers-4.4.0-70 linux-headers-4.4.0-70-通用 linux-headers-4.4.0-71 linux-headers-4.4.0-71-通用 linux-headers-4.4.0-72 linux-headers-4.4.0-72-通用 linux-headers-4.4.0-75 linux-headers-4.4.0-75-通用 linux-headers-4.4.0-77 linux-headers-4.4.0-77-通用 linux-headers-4.4.0-78 linux-headers-4.4.0-78-通用 linux-headers-4.4.0-79 linux-headers-4.4.0-79-通用 linux-headers-4.4.0-81 linux-headers-4.4.0-81-通用 linux-headers-4.4.0-83 linux-headers-4.4.0-83-通用 linux-headers-4.4.0-87 linux-headers-4.4.0-87-通用 linux-headers-4.4.0-89 linux-headers-4.4.0-89-通用 linux-image-4.4.0-65-通用 linux-image-4.4.0-66-通用 linux-image-4.4.0-70-通用 linux-image-4.4.0-71-通用 linux-image-4.4.0-72-通用 linux-image-4.4.0-75-通用 linux-image-4.4.0-77-通用 linux-image-4.4.0-78-通用 linux-image-4.4.0-79-通用 linux-image-4.4.0-81-通用 linux-image-4.4.0-83-通用 linux-image-4.4.0-87-通用 linux-image-4.4.0-89-通用 linux-image-extra-4.4.0-65-通用 linux-image-extra-4.4.0-66-通用 linux-image-extra-4.4.0-70-通用 linux-image-extra-4.4.0-71-通用 linux-image-extra-4.4.0-72-通用 linux-image-extra-4.4.0-75-通用 linux-image-extra-4.4.0-77-通用 linux-image-extra-4.4.0-78-通用 linux-image-extra-4.4.0-79-通用 linux-image-extra-4.4.0-81-通用 linux-image-extra-4.4.0-83-通用 linux-image-extra-4.4.0-87-通用 linux-image-extra-4.4.0-89-通用 linux-signed-image-4.4.0-65-通用 linux-signed-image-4.4.0-66-通用 linux-signed-image-4.4.0-70-通用 linux-signed-image-4.4.0-71-通用 linux-signed-image-4.4.0-72-通用 linux-signed-image-4.4.0-75-通用 linux-signed-image-4.4.0-77-通用 linux-signed-image-4.4.0-78-通用 linux-signed-image-4.4.0-79-通用 linux-signed-image-4.4.0-81-通用 linux-signed-image-4.4.0-83-通用 linux-signed-image-4.4.0-87-通用 linux-signed-image-4.4.0-89-通用 snap-confine ubuntu-core-launcher 使用“sudo apt autoremove”来删除它们。 将安装以下新软件包 linux-headers-4.4.0-98 linux-headers-4.4.0-98-通用 linux-image-4.4.0-98-通用 Linux-image-extra-4.4.0-98-通用 Linux-signed-image-4.4.0-98-通用 以下软件包将会升级： apparmor apport apport-gtk apport-retrace bind9-host binutils bluez bluez-cups bluez-obexd ca-certificates cpp-5 cracklib-runtime 崩溃 cryptsetup-bin cups cups-bsd cups-client cups-common cups-core-drivers cups-daemon cups-ppdc cups-server-common debootstrap distro-info-data dnsmasq-base dnsutils evince evince-common firefox firefox-locale-en flashplugin-installer g++-5 gcc-5 gcc-5-base gcc-5-base:i386 ghostscript ghostscript-x gir1.2-gdkpixbuf-2.0 gir1.2-javascriptcoregtk-4.0 gir1.2-packagekitglib-1.0 gir1.2-webkit2-4.0 git git-man gnome-软件 gnome-软件-通用 grub-通用 grub-efi-amd64 grub-efi-amd64-bin grub-efi-amd64-signed grub2-通用 gvfs gvfs-后端 gvfs-bin gvfs-通用 gvfs-守护进程 gvfs-fuse gvfs-libs initramfs-工具 initramfs-tools-bin initramfs-tools-core iproute iproute2 libapparmor-perl libapparmor1 libasan2 libatomic1 libbind9-140 libbluetooth3 libcc1-0 libcilkrts5 libcrack2 libcryptsetup4 libcups2 libcups2:i386 libcupscgi1 libcupsimage2 libcupsmime1 libcupsppdc1 libcurl3 libcurl3-gnutls libdns-export162 libdns162 libegl1-mesa libevdocument3-4 libevview3-3 libgbm1 libgcc-5-dev libgd3 libgd3:i386 libgdk-pixbuf2.0-0 libgdk-pixbuf2.0-common libgfortran3 libgl1-mesa-dri libgl1-mesa-dri:i386 libgl1-mesa-glx libgl1-mesa-glx:i386 libglapi-mesa libglapi-mesa:i386 libgles2-mesa libgnutls-openssl27 libgnutls30 libgnutls30:i386 libgomp1 libgraphite2-3 libgs9 libgs9-公共 libicu55 libicu55:i386 libidn11 libidn11:i386 libisc-export160 libisc160 libisccc140 libisccfg140 libitm1 libjavascriptcoregtk-4.0-18 liblouis-data liblouis9 liblsan0 liblwres141 libmirclient9 libmircommon7 libmircore1 libmirprotobuf3 libmpx0 libmysqlclient20:i386 libnm-gtk-common libnm-gtk0 libnma-common libnma0 libnss-winbind libnss3 libnss3-1d libnss3-nssdb libosmesa6 libosmesa6:i386 libpackagekit-glib2-16 libpam-systemd libpam-winbind libperl5.22 libplist3 libplymouth4 libpoppler-glib8 libpoppler58 libpulse-mainloop-glib0 libpulse0 libpulse0：i386 libpulsedsp libpython3.5 libpython3.5-minimal libpython3.5-stdlib libquadmath0 libsmbclient libsnapd-glib1 libssl-dev libssl-doc libssl1.0.0 libssl1.0.0:i386 libstdc++-5-dev libstdc++6 libstdc++6:i386 libsystemd0 libsystemd0:i386 libtsan0 libubsan0 libudev-dev libudev1 libudev1:i386 libwayland-client0 libwayland-cursor0 libwayland-egl1-mesa libwayland-server0 libwbclient0 libwebkit2gtk-4.0-37 libwebkit2gtk-4.0-37-gtk2 libxatracker2 libxfont1 libxml2 libxml2:i386 libxml2-utils linux-固件 linux-通用 linux-headers-generic linux-image-generic linux-libc-dev linux-signed-generic linux-signed-image-generic logrotate lshw makedumpfile mesa-vdpau-drivers mysql-common network-manager-gnome ntpdate openssl perl perl-base perl-模块-5.22 plymouth plymouth 标签 plymouth 主题-ubuntu 徽标 plymouth 主题-ubuntu 文本 poppler-utils postfix pulseaudio pulseaudio-module-bluetooth pulseaudio-module-x11 pulseaudio-utils python-apport python-jwt python-libxml2 python-问题报告 python-samba python3-apport python3-distupgrade python3-jwt python3-louis python3-问题报告 python3-更新管理器 python3.5 python3.5-minimal qemu-user-static resolvconf samba samba-common samba-common-bin samba-dsdb-模块 samba-libs samba-vfs-模块 smbclient snap-confine snapd snapd-login-service systemd systemd-sysv tcpdump texlive-base texlive-fonts-recommended texlive-通用推荐 texlive-latex-base texlive-latex-推荐 thunderbird thunderbird-gnome-支持 thunderbird-locale-en thunderbird-locale-en-gb thunderbird-locale-en-us tzdata ubuntu-core-launcher ubuntu 桌面 ubuntu 驱动程序-通用 ubuntu 最小 ubuntu 发布升级程序核心 ubuntu 发布升级程序-gtk ubuntu 软件 ubuntu 标准 udev 更新管理器 更新管理器核心 更新通知程序 更新通知程序通用 wget winbind wpasupplicant xserver-common xserver-xorg-core xul-ext-ubufox 266 个为升级，5 个为全新安装，0 个为删除，0 个为不升级。 需要获取 95.1 MB/427 MB 的档案。 此操作后，将使用368 MB的额外磁盘空间。 您想继续吗？[Y/n] n
无人值守升级大约每两天运行一次，如 /var/log/unattended-upgrades/unattended-upgrades.log 的内容所示：
2017-11-10 19:11:17,755 INFO 初始列入黑名单的软件包： 2017-11-10 19:11:17,756 INFO 初始白名单软件包： 2017-11-10 19:11:17,756 INFO 启动无人值守升级脚本 2017-11-10 19:11:17,756 INFO 允许的来源是：['o=Ubuntu,a=xenial', 'o=Ubuntu,a=xenial-security', 'o=UbuntuESM,a=xenial'] 2017-11-11 14:10:07,827 INFO 初始列入黑名单的软件包： 2017-11-11 14:10:07,828 INFO 初始白名单软件包： 2017-11-11 14:10:07,828 INFO 启动无人值守升级脚本 2017-11-11 14:10:07,828 INFO 允许的来源是：['o=Ubuntu,a=xenial', 'o=Ubuntu,a=xenial-security', 'o=UbuntuESM,a=xenial'] 2017-11-14 00:07:21,327 INFO 初始列入黑名单的软件包： 2017-11-14 00:07:21,328 INFO 初始白名单软件包： 2017-11-14 00:07:21,328 INFO 启动无人值守升级脚本 2017-11-14 00:07:21,328 INFO 允许的来源是：['o=Ubuntu,a=xenial', 'o=Ubuntu,a=xenial-security', 'o=UbuntuESM,a=xenial'] 2017-11-16 18:47:23,067 INFO 初始列入黑名单的软件包： 2017-11-16 18:47:23,067 INFO 初始白名单软件包： 2017-11-16 18:47:23,067 INFO 启动无人值守升级脚本 2017-11-16 18:47:23,068 INFO 允许的来源是：['o=Ubuntu,a=xenial', 'o=Ubuntu,a=xenial-security', 'o=UbuntuESM,a=xenial'] 2017-11-17 12:08:29,321 INFO 初始列入黑名单的软件包： 2017-11-17 12:08:29,321 INFO 初始白名单软件包： 2017-11-17 12:08:29,322 INFO 启动无人值守升级脚本 2017-11-17 12:08:29,322 INFO 允许的来源是：['o=Ubuntu,a=xenial', 'o=Ubuntu,a=xenial-security', 'o=UbuntuESM,a=xenial']
输出sudo unattended-upgrades --dry-run显示 unattended-upgrades 知道它需要安装更新的软件包：
从包中提取模板：100% 预配置包... /usr/bin/dpkg --status-fd 9 --unpack --auto-deconfigure /var/cache/apt/archives/libperl5.22_5.22.1-9ubuntu0.2_amd64.deb /var/cache/apt/archives/perl_5.22.1-9ubuntu0.2_amd64.deb /var/cache/apt/archives/perl-base_5.22.1-9ubuntu0.2_amd64.deb /usr/bin/dpkg --status-fd 11 --配置 perl-base:amd64 /usr/bin/dpkg --status-fd 13 --unpack --auto-deconfigure /var/cache/apt/archives/perl-modules-5.22_5.22.1-9ubuntu0.2_all.deb /var/cache/apt/archives/samba-dsdb-modules_2%3a4.3.11+dfsg-0ubuntu0.16.04.11_amd64.deb /var/cache/apt/archives/libnss-winbind_2%3a4.3.11+dfsg-0ubuntu0.16.04.11_amd64.deb /var/cache/apt/archives/libpam-winbind_2%3a4.3.11+dfsg-0ubuntu0.16.04.11_amd64.deb /var/cache/apt/archives/winbind_2%3a4.3.11+dfsg-0ubuntu0.16.04.11_amd64.deb /var/cache/apt/archives/samba_2%3a4.3.11+dfsg-0ubuntu0.16.04.11_amd64.deb /var/cache/apt/archives/samba-common-bin_2%3a4.3.11+dfsg-0ubuntu0.16.04.11_amd64.deb /var/cache/apt/archives/smbclient_2%3a4.3.11+dfsg-0ubuntu0.16.04.11_amd64.deb /var/cache/apt/archives/python-samba_2%3a4.3.11+dfsg-0ubuntu0.16.04.11_amd64.deb /var/cache/apt/archives/samba-vfs-modules_2%3a4.3.11+dfsg-0ubuntu0.16.04.11_amd64.deb /var/cache/apt/archives/samba-libs_2%3a4.3.11+dfsg-0ubuntu0.16.04.11_amd64.deb /var/cache/apt/archives/libwbclient0_2%3a4.3.11+dfsg-0ubuntu0.16.04.11_amd64.deb /var/cache/apt/archives/libsmbclient_2%3a4.3.11+dfsg-0ubuntu0.16.04.11_amd64.deb /var/cache/apt/archives/samba-common_2%3a4.3.11+dfsg-0ubuntu0.16.04.11_all.deb /var/cache/apt/archives/tzdata_2017c-0ubuntu0.16.04_all.deb /var/cache/apt/archives/libisc-export160_1%3a9.10.3.dfsg.P4-8ubuntu1.8_amd64.deb /var/cache/apt/archives/libdns-export162_1%3a9.10.3.dfsg.P4-8ubuntu1.8_amd64.deb /var/cache/apt/archives/libidn11_1.32-3ubuntu1.2_amd64.deb /var/cache/apt/archives/libidn11_1.32-3ubuntu1.2_i386.deb /var/cache/apt/archives/libssl-doc_1.0.2g-1ubuntu4.9_all.deb /var/cache/apt/archives/libssl-dev_1.0.2g-1ubuntu4.9_amd64.deb /var/cache/apt/archives/libssl1.0.0_1.0.2g-1ubuntu4.9_i386.deb /var/cache/apt/archives/libssl1.0.0_1.0.2g-1ubuntu4.9_amd64.deb /var/cache/apt/archives/libicu55_55.1-7ubuntu0.3_i386.deb /var/cache/apt/archives/libicu55_55.1-7ubuntu0.3_amd64.deb /var/cache/apt/archives/libxml2_2.9.3+dfsg1-1ubuntu0.3_amd64.deb /var/cache/apt/archives/libxml2_2.9.3+dfsg1-1ubuntu0.3_i386.deb /var/cache/apt/archives/bind9-host_1%3a9.10.3.dfsg.P4-8ubuntu1.8_amd64.deb /var/cache/apt/archives/dnsutils_1%3a9.10.3.dfsg.P4-8ubuntu1.8_amd64.deb /var/cache/apt/archives/libisc160_1%3a9.10.3.dfsg.P4-8ubuntu1.8_amd64.deb /var/cache/apt/archives/libdns162_1%3a9.10.3.dfsg.P4-8ubuntu1.8_amd64.deb /var/cache/apt/archives/libisccc140_1%3a9.10.3.dfsg.P4-8ubuntu1.8_amd64.deb /var/cache/apt/archives/libisccfg140_1%3a9.10.3.dfsg.P4-8ubuntu1.8_amd64.deb /var/cache/apt/archives/liblwres141_1%3a9.10.3.dfsg.P4-8ubuntu1.8_amd64.deb /var/cache/apt/archives/libbind9-140_1%3a9.10.3.dfsg.P4-8ubuntu1.8_amd64.deb /var/cache/apt/archives/openssl_1.0.2g-1ubuntu4.9_amd64.deb /var/cache/apt/archives/ca-certificates_20170717~16.04.1_all.deb /var/cache/apt/archives/libcurl3-gnutls_7.47.0-1ubuntu2.4_amd64.deb /var/cache/apt/archives/tcpdump_4.9.2-0ubuntu0.16.04.1_amd64.deb /var/cache/apt/archives/wget_1.17.1-1ubuntu1.3_amd64.deb /var/cache/apt/archives/python3-problem-report_2.20.1-0ubuntu2.12_all.deb /var/cache/apt/archives/python3-apport_2.20.1-0ubuntu2.12_all.deb /var/cache/apt/archives/apport_2.20.1-0ubuntu2.12_all.deb /var/cache/apt/archives/apport-gtk_2.20.1-0ubuntu2.12_all.deb /var/cache/apt/archives/python-problem-report_2.20.1-0ubuntu2.12_all.deb /var/cache/apt/archives/python-apport_2.20.1-0ubuntu2.12_all.deb /var/cache/apt/archives/apport-retrace_2.20.1-0ubuntu2.12_all.deb /var/cache/apt/archives/bluez_5.37-0ubuntu5.1_amd64.deb /var/cache/apt/archives/bluez-cups_5.37-0ubuntu5.1_amd64.deb /var/cache/apt/archives/bluez-obexd_5.37-0ubuntu5.1_amd64.deb /var/cache/apt/archives/dnsmasq-base_2.75-1ubuntu0.16.04.3_amd64.deb /var/cache/apt/archives/libgdk-pixbuf2.0-0_2.32.2-1ubuntu1.3_amd64.deb /var/cache/apt/archives/libgdk-pixbuf2.0-common_2.32.2-1ubuntu1.3_all.deb /var/cache/apt/archives/firefox_57.0+build4-0ubuntu0.16.04.5_amd64.deb /var/cache/apt/archives/firefox-locale-en_57.0+build4-0ubuntu0.16.04.5_amd64.deb /var/cache/apt/archives/libnss3-nssdb_2%3a3.28.4-0ubuntu0.16.04.3_all.deb /var/cache/apt/archives/libnss3-1d_2%3a3.28.4-0ubuntu0.16.04.3_amd64.deb /var/cache/apt/archives/libnss3_2%3a3.28.4-0ubuntu0.16.04.3_amd64.deb /var/cache/apt/archives/libcurl3_7.47.0-1ubuntu2.4_amd64.deb /var/cache/apt/archives/flashplugin-installer_27.0.0.187ubuntu0.16.04.1_amd64.deb /var/cache/apt/archives/ghostscript_9.18~dfsg~0-0ubuntu2.7_amd64.deb /var/cache/apt/archives/ghostscript-x_9.18~dfsg~0-0ubuntu2.7_amd64.deb /var/cache/apt/archives/libgs9-common_9.18~dfsg~0-0ubuntu2.7_all.deb /var/cache/apt/archives/libgs9_9.18~dfsg~0-0ubuntu2.7_amd64.deb /var/cache/apt/archives/gir1.2-gdkpixbuf-2.0_2.32.2-1ubuntu1.3_amd64.deb /var/cache/apt/archives/libwebkit2gtk-4.0-37-gtk2_2.18.3-0ubuntu0.16.04.1_amd64.deb /var/cache/apt/archives/libwebkit2gtk-4.0-37_2.18.3-0ubuntu0.16.04.1_amd64.deb /var/cache/apt/archives/libjavascriptcoregtk-4.0-18_2.18.3-0ubuntu0.16.04.1_amd64.deb /var/cache/apt/archives/libwayland-client0_1.12.0-1~ubuntu16.04.2_amd64.deb /var/cache/apt/archives/libwayland-server0_1.12.0-1~ubuntu16.04.2_amd64.deb /var/cache/apt/archives/gir1.2-webkit2-4.0_2.18.3-0ubuntu0.16.04.1_amd64.deb /var/cache/apt/archives/gir1.2-javascriptcoregtk-4.0_2.18.3-0ubuntu0.16.04.1_amd64.deb /var/cache/apt/archives/git-man_1%3a2.7.4-0ubuntu1.3_all.deb /var/cache/apt/archives/git_1%3a2.7.4-0ubuntu1.3_amd64.deb /var/cache/apt/archives/libbluetooth3_5.37-0ubuntu5.1_amd64.deb /var/cache/apt/archives/libgd3_2.1.1-4ubuntu0.16.04.8_amd64.deb /var/cache/apt/archives/libgd3_2.1.1-4ubuntu0.16.04.8_i386.deb /var/cache/apt/archives/libgraphite2-3_1.3.10-0ubuntu0.16.04.1_amd64.deb /var/cache/apt/archives/libmircore1_0.26.3+16.04.20170605-0ubuntu1.1_amd64.deb /var/cache/apt/archives/libmircommon7_0.26.3+16.04.20170605-0ubuntu1.1_amd64.deb /var/cache/apt/archives/libmirprotobuf3_0.26.3+16.04.20170605-0ubuntu1.1_amd64.deb /var/cache/apt/archives/libmirclient9_0.26.3+16.04.20170605-0ubuntu1.1_amd64.deb /var/cache/apt/archives/mysql-common_5.7.20-0ubuntu0.16.04.1_all。deb /var/cache/apt/archives/libmysqlclient20_5.7.20-0ubuntu0.16.04.1_i386.deb /var/cache/apt/archives/libplist3_1.12-3.1ubuntu0.16.04.1_amd64.deb /var/cache/apt/archives/libpoppler58_0.41.0-0ubuntu1.5_amd64.deb /var/cache/apt/archives/libpoppler-glib8_0.41.0-0ubuntu1.5_amd64.deb /var/cache/apt/archives/libwayland-cursor0_1.12.0-1~ubuntu16.04.2_amd64.deb /var/cache/apt/archives/libxfont1_1%3a1.5.1-1ubuntu0.16.04.3_amd64.deb /var/cache/apt/archives/libxml2-utils_2.9.3+dfsg1-1ubuntu0.3_amd64.deb 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/var/cache/apt/archives/liblouis-data_2.6.4-2ubuntu0.1_all.deb /var/cache/apt/archives/liblouis9_2.6.4-2ubuntu0.1_amd64.deb /var/cache/apt/archives/python3-louis_2.6.4-2ubuntu0.1_all.debdeb /var/cache/apt/archives/libwayland-cursor0_1.12.0-1~ubuntu16.04.2_amd64.deb /var/cache/apt/archives/libxfont1_1%3a1.5.1-1ubuntu0.16.04.3_amd64.deb /var/cache/apt/archives/libxml2-utils_2.9.3+dfsg1-1ubuntu0.3_amd64.deb /var/cache/apt/archives/linux-firmware_1.157.13_all.deb /var/cache/apt/archives/linux-image-4.4.0-98-generic_4.4.0-98.121_amd64.deb /var/cache/apt/archives/linux-image-extra-4.4.0-98-generic_4.4.0-98.121_amd64.deb /var/cache/apt/archives/linux-generic_4.4.0.98.103_amd64.deb /var/cache/apt/archives/linux-image-generic_4.4.0.98.103_amd64.deb /var/cache/apt/archives/linux-signed-image-4.4.0-98-generic_4.4.0-98.121_amd64.deb /var/cache/apt/archives/linux-signed-generic_4.4.0.98.103_amd64.deb /var/cache/apt/archives/linux-signed-image-generic_4.4.0.98.103_amd64.deb /var/cache/apt/archives/linux-headers-4.4.0-98_4.4.0-98.121_all.deb /var/cache/apt/archives/linux-headers-4.4.0-98-generic_4.4.0-98.121_amd64.deb /var/cache/apt/archives/linux-headers-generic_4.4.0.98.103_amd64.deb /var/cache/apt/archives/linux-libc-dev_4.4.0-98.121_amd64.deb /var/cache/apt/archives/poppler-utils_0.41.0-0ubuntu1.5_amd64.deb /var/cache/apt/archives/python-jwt_1.3.0-1ubuntu0.1_all.deb /var/cache/apt/archives/python-libxml2_2.9.3+dfsg1-1ubuntu0.3_amd64.deb /var/cache/apt/archives/python3-jwt_1.3.0-1ubuntu0.1_all.deb /var/cache/apt/archives/qemu-user-static_1%3a2.5+dfsg-5ubuntu10.16_amd64.deb /var/cache/apt/archives/texlive-fonts-recommended_2015.20160320-1ubuntu0.1_all.deb /var/cache/apt/archives/texlive-latex-base_2015.20160320-1ubuntu0.1_all.deb /var/cache/apt/archives/texlive-latex-recommended_2015.20160320-1ubuntu0.1_all.deb /var/cache/apt/archives/texlive-generic-recommended_2015.20160320-1ubuntu0.1_all.deb /var/cache/apt/archives/texlive-base_2015.20160320-1ubuntu0.1_all.deb /var/cache/apt/archives/thunderbird-locale-en_1%3a52.4.0+build1-0ubuntu0.16.04.2_amd64.deb /var/cache/apt/archives/thunderbird_1%3a52.4.0+build1-0ubuntu0.16.04.2_amd64.deb /var/cache/apt/archives/thunderbird-gnome-support_1%3a52.4.0+build1-0ubuntu0.16.04.2_amd64.deb /var/cache/apt/archives/thunderbird-locale-en-gb_1%3a52.4.0+build1-0ubuntu0.16.04.2_all.deb /var/cache/apt/archives/thunderbird-locale-en-us_1%3a52.4.0+build1-0ubuntu0.16.04.2_all.deb /var/cache/apt/archives/wpasupplicant_2.4-0ubuntu6.2_amd64.deb /var/cache/apt/archives/xserver-common_2%3a1.18.4-0ubuntu0.7_all.deb /var/cache/apt/archives/xserver-xorg-core_2%3a1.18.4-0ubuntu0.7_amd64.deb /var/cache/apt/archives/xul-ext-ubufox_3.4-0ubuntu0.16.04.2_all.deb /var/cache/apt/archives/liblouis-data_2.6.4-2ubuntu0.1_all.deb /var/cache/apt/archives/liblouis9_2.6.4-2ubuntu0.1_amd64.deb /var/cache/apt/archives/python3-louis_2.6.4-2ubuntu0.1_all.deb0-98-generic_4.4.0-98.121_amd64.deb /var/cache/apt/archives/linux-image-extra-4.4.0-98-generic_4.4.0-98.121_amd64.deb /var/cache/apt/archives/linux-generic_4.4.0.98.103_amd64.deb /var/cache/apt/archives/linux-image-generic_4.4.0.98.103_amd64.deb /var/cache/apt/archives/linux-signed-image-4.4.0-98-generic_4.4.0-98.121_amd64.deb /var/cache/apt/archives/linux-signed-generic_4.4.0.98.103_amd64.deb /var/cache/apt/archives/linux-signed-image-generic_4.4.0.98.103_amd64.deb /var/cache/apt/archives/linux-headers-4.4.0-98_4.4.0-98.121_all.deb /var/cache/apt/archives/linux-headers-4.4.0-98-generic_4.4.0-98.121_amd64.deb /var/cache/apt/archives/linux-headers-generic_4.4.0.98.103_amd64.deb /var/cache/apt/archives/linux-libc-dev_4.4.0-98.121_amd64.deb /var/cache/apt/archives/poppler-utils_0.41.0-0ubuntu1.5_amd64.deb /var/cache/apt/archives/python-jwt_1.3.0-1ubuntu0.1_all.deb /var/cache/apt/archives/python-libxml2_2.9.3+dfsg1-1ubuntu0.3_amd64.deb /var/cache/apt/archives/python3-jwt_1.3.0-1ubuntu0.1_all.deb /var/cache/apt/archives/qemu-user-static_1%3a2.5+dfsg-5ubuntu10.16_amd64.deb /var/cache/apt/archives/texlive-fonts-recommended_2015.20160320-1ubuntu0.1_all.deb /var/cache/apt/archives/texlive-latex-base_2015.20160320-1ubuntu0.1_all.deb /var/cache/apt/archives/texlive-latex-recommended_2015.20160320-1ubuntu0.1_all.deb /var/cache/apt/archives/texlive-generic-recommended_2015.20160320-1ubuntu0.1_all.deb /var/cache/apt/archives/texlive-base_2015.20160320-1ubuntu0.1_all.deb /var/cache/apt/archives/thunderbird-locale-en_1%3a52.4.0+build1-0ubuntu0.16.04.2_amd64.deb /var/cache/apt/archives/thunderbird_1%3a52.4.0+build1-0ubuntu0.16.04.2_amd64.deb /var/cache/apt/archives/thunderbird-gnome-support_1%3a52.4.0+build1-0ubuntu0.16.04.2_amd64.deb /var/cache/apt/archives/thunderbird-locale-en-gb_1%3a52.4.0+build1-0ubuntu0.16.04.2_all.deb /var/cache/apt/archives/thunderbird-locale-en-us_1%3a52.4.0+build1-0ubuntu0.16.04.2_all.deb /var/cache/apt/archives/wpasupplicant_2.4-0ubuntu6.2_amd64.deb /var/cache/apt/archives/xserver-common_2%3a1.18.4-0ubuntu0.7_all.deb /var/cache/apt/archives/xserver-xorg-core_2%3a1.18.4-0ubuntu0.7_amd64.deb /var/cache/apt/archives/xul-ext-ubufox_3.4-0ubuntu0.16.04.2_all.deb /var/cache/apt/archives/liblouis-data_2.6.4-2ubuntu0.1_all.deb /var/cache/apt/archives/liblouis9_2.6.4-2ubuntu0.1_amd64.deb /var/cache/apt/archives/python3-louis_2.6.4-2ubuntu0.1_all.deb0-98-generic_4.4.0-98.121_amd64.deb /var/cache/apt/archives/linux-image-extra-4.4.0-98-generic_4.4.0-98.121_amd64.deb /var/cache/apt/archives/linux-generic_4.4.0.98.103_amd64.deb /var/cache/apt/archives/linux-image-generic_4.4.0.98.103_amd64.deb /var/cache/apt/archives/linux-signed-image-4.4.0-98-generic_4.4.0-98.121_amd64.deb /var/cache/apt/archives/linux-signed-generic_4.4.0.98.103_amd64.deb /var/cache/apt/archives/linux-signed-image-generic_4.4.0.98.103_amd64.deb /var/cache/apt/archives/linux-headers-4.4.0-98_4.4.0-98.121_all.deb /var/cache/apt/archives/linux-headers-4.4.0-98-generic_4.4.0-98.121_amd64.deb /var/cache/apt/archives/linux-headers-generic_4.4.0.98.103_amd64.deb /var/cache/apt/archives/linux-libc-dev_4.4.0-98.121_amd64.deb /var/cache/apt/archives/poppler-utils_0.41.0-0ubuntu1.5_amd64.deb /var/cache/apt/archives/python-jwt_1.3.0-1ubuntu0.1_all.deb /var/cache/apt/archives/python-libxml2_2.9.3+dfsg1-1ubuntu0.3_amd64.deb /var/cache/apt/archives/python3-jwt_1.3.0-1ubuntu0.1_all.deb /var/cache/apt/archives/qemu-user-static_1%3a2.5+dfsg-5ubuntu10.16_amd64.deb /var/cache/apt/archives/texlive-fonts-recommended_2015.20160320-1ubuntu0.1_all.deb /var/cache/apt/archives/texlive-latex-base_2015.20160320-1ubuntu0.1_all.deb /var/cache/apt/archives/texlive-latex-recommended_2015.20160320-1ubuntu0.1_all.deb /var/cache/apt/archives/texlive-generic-recommended_2015.20160320-1ubuntu0.1_all.deb /var/cache/apt/archives/texlive-base_2015.20160320-1ubuntu0.1_all.deb /var/cache/apt/archives/thunderbird-locale-en_1%3a52.4.0+build1-0ubuntu0.16.04.2_amd64.deb /var/cache/apt/archives/thunderbird_1%3a52.4.0+build1-0ubuntu0.16.04.2_amd64.deb /var/cache/apt/archives/thunderbird-gnome-support_1%3a52.4.0+build1-0ubuntu0.16.04.2_amd64.deb /var/cache/apt/archives/thunderbird-locale-en-gb_1%3a52.4.0+build1-0ubuntu0.16.04.2_all.deb /var/cache/apt/archives/thunderbird-locale-en-us_1%3a52.4.0+build1-0ubuntu0.16.04.2_all.deb /var/cache/apt/archives/wpasupplicant_2.4-0ubuntu6.2_amd64.deb /var/cache/apt/archives/xserver-common_2%3a1.18.4-0ubuntu0.7_all.deb /var/cache/apt/archives/xserver-xorg-core_2%3a1.18.4-0ubuntu0.7_amd64.deb /var/cache/apt/archives/xul-ext-ubufox_3.4-0ubuntu0.16.04.2_all.deb /var/cache/apt/archives/liblouis-data_2.6.4-2ubuntu0.1_all.deb /var/cache/apt/archives/liblouis9_2.6.4-2ubuntu0.1_amd64.deb /var/cache/apt/archives/python3-louis_2.6.4-2ubuntu0.1_all.debdeb /var/cache/apt/archives/linux-headers-generic_4.4.0.98.103_amd64.deb /var/cache/apt/archives/linux-libc-dev_4.4.0-98.121_amd64.deb /var/cache/apt/archives/poppler-utils_0.41.0-0ubuntu1.5_amd64.deb /var/cache/apt/archives/python-jwt_1.3.0-1ubuntu0.1_all.deb /var/cache/apt/archives/python-libxml2_2.9.3+dfsg1-1ubuntu0.3_amd64.deb /var/cache/apt/archives/python3-jwt_1.3.0-1ubuntu0.1_all.deb /var/cache/apt/archives/qemu-user-static_1%3a2.5+dfsg-5ubuntu10.16_amd64.deb /var/cache/apt/archives/texlive-fonts-recommended_2015.20160320-1ubuntu0.1_all.deb /var/cache/apt/archives/texlive-latex-base_2015.20160320-1ubuntu0.1_all.deb /var/cache/apt/archives/texlive-latex-recommended_2015.20160320-1ubuntu0.1_all.deb /var/cache/apt/archives/texlive-generic-recommended_2015.20160320-1ubuntu0.1_all.deb /var/cache/apt/archives/texlive-base_2015.20160320-1ubuntu0.1_all.deb /var/cache/apt/archives/thunderbird-locale-en_1%3a52.4.0+build1-0ubuntu0.16.04.2_amd64.deb /var/cache/apt/archives/thunderbird_1%3a52.4.0+build1-0ubuntu0.16.04.2_amd64.deb /var/cache/apt/archives/thunderbird-gnome-support_1%3a52.4.0+build1-0ubuntu0.16.04.2_amd64.deb /var/cache/apt/archives/thunderbird-locale-en-gb_1%3a52.4.0+build1-0ubuntu0.16.04.2_all.deb /var/cache/apt/archives/thunderbird-locale-en-us_1%3a52.4.0+build1-0ubuntu0.16.04.2_all.deb /var/cache/apt/archives/wpasupplicant_2.4-0ubuntu6.2_amd64.deb /var/cache/apt/archives/xserver-common_2%3a1.18.4-0ubuntu0.7_all.deb /var/cache/apt/archives/xserver-xorg-core_2%3a1.18.4-0ubuntu0.7_amd64.deb /var/cache/apt/archives/xul-ext-ubufox_3.4-0ubuntu0.16.04.2_all.deb /var/cache/apt/archives/liblouis-data_2.6.4-2ubuntu0.1_all.deb /var/cache/apt/archives/liblouis9_2.6.4-2ubuntu0.1_amd64.deb /var/cache/apt/archives/python3-louis_2.6.4-2ubuntu0.1_all.debdeb /var/cache/apt/archives/linux-headers-generic_4.4.0.98.103_amd64.deb /var/cache/apt/archives/linux-libc-dev_4.4.0-98.121_amd64.deb /var/cache/apt/archives/poppler-utils_0.41.0-0ubuntu1.5_amd64.deb /var/cache/apt/archives/python-jwt_1.3.0-1ubuntu0.1_all.deb /var/cache/apt/archives/python-libxml2_2.9.3+dfsg1-1ubuntu0.3_amd64.deb /var/cache/apt/archives/python3-jwt_1.3.0-1ubuntu0.1_all.deb /var/cache/apt/archives/qemu-user-static_1%3a2.5+dfsg-5ubuntu10.16_amd64.deb /var/cache/apt/archives/texlive-fonts-recommended_2015.20160320-1ubuntu0.1_all.deb /var/cache/apt/archives/texlive-latex-base_2015.20160320-1ubuntu0.1_all.deb /var/cache/apt/archives/texlive-latex-recommended_2015.20160320-1ubuntu0.1_all.deb /var/cache/apt/archives/texlive-generic-recommended_2015.20160320-1ubuntu0.1_all.deb /var/cache/apt/archives/texlive-base_2015.20160320-1ubuntu0.1_all.deb /var/cache/apt/archives/thunderbird-locale-en_1%3a52.4.0+build1-0ubuntu0.16.04.2_amd64.deb /var/cache/apt/archives/thunderbird_1%3a52.4.0+build1-0ubuntu0.16.04.2_amd64.deb /var/cache/apt/archives/thunderbird-gnome-support_1%3a52.4.0+build1-0ubuntu0.16.04.2_amd64.deb /var/cache/apt/archives/thunderbird-locale-en-gb_1%3a52.4.0+build1-0ubuntu0.16.04.2_all.deb /var/cache/apt/archives/thunderbird-locale-en-us_1%3a52.4.0+build1-0ubuntu0.16.04.2_all.deb /var/cache/apt/archives/wpasupplicant_2.4-0ubuntu6.2_amd64.deb /var/cache/apt/archives/xserver-common_2%3a1.18.4-0ubuntu0.7_all.deb /var/cache/apt/archives/xserver-xorg-core_2%3a1.18.4-0ubuntu0.7_amd64.deb /var/cache/apt/archives/xul-ext-ubufox_3.4-0ubuntu0.16.04.2_all.deb /var/cache/apt/archives/liblouis-data_2.6.4-2ubuntu0.1_all.deb /var/cache/apt/archives/liblouis9_2.6.4-2ubuntu0.1_amd64.deb /var/cache/apt/archives/python3-louis_2.6.4-2ubuntu0.1_all.debdeb /var/cache/apt/archives/thunderbird-locale-en-us_1%3a52.4.0+build1-0ubuntu0.16.04.2_all.deb /var/cache/apt/archives/wpasupplicant_2.4-0ubuntu6.2_amd64.deb /var/cache/apt/archives/xserver-common_2%3a1.18.4-0ubuntu0.7_all.deb /var/cache/apt/archives/xserver-xorg-core_2%3a1.18.4-0ubuntu0.7_amd64.deb /var/cache/apt/archives/xul-ext-ubufox_3.4-0ubuntu0.16.04.2_all.deb /var/cache/apt/archives/liblouis-data_2.6.4-2ubuntu0.1_all.deb /var/cache/apt/archives/liblouis9_2.6.4-2ubuntu0.1_amd64.deb /var/cache/apt/archives/python3-louis_2.6.4-2ubuntu0.1_all.debdeb /var/cache/apt/archives/thunderbird-locale-en-us_1%3a52.4.0+build1-0ubuntu0.16.04.2_all.deb /var/cache/apt/archives/wpasupplicant_2.4-0ubuntu6.2_amd64.deb /var/cache/apt/archives/xserver-common_2%3a1.18.4-0ubuntu0.7_all.deb /var/cache/apt/archives/xserver-xorg-core_2%3a1.18.4-0ubuntu0.7_amd64.deb /var/cache/apt/archives/xul-ext-ubufox_3.4-0ubuntu0.16.04.2_all.deb /var/cache/apt/archives/liblouis-data_2.6.4-2ubuntu0.1_all.deb /var/cache/apt/archives/liblouis9_2.6.4-2ubuntu0.1_amd64.deb /var/cache/apt/archives/python3-louis_2.6.4-2ubuntu0.1_all.deb /usr/bin/dpkg --status-fd 15 --配置 perl-modules-5.22:all libperl5.22:amd64 perl:amd64 libwbclient0:amd64 samba-libs:amd64 samba-dsdb-modules:amd64 samba-common:all python-samba:amd64 samba-common-bin:amd64 samba:amd64 winbind:amd64 libnss-winbind:amd64 libpam-winbind:amd64 libsmbclient:amd64 smbclient:amd64 samba-vfs-modules:amd64 tzdata:all libisc-export160:amd64 libdns-export162:amd64 libidn11:i386 libidn11:amd64 libssl-doc：全部 libssl1.0.0：amd64 libssl1.0.0：i386 libssl-dev：amd64 libicu55：amd64 libicu55：i386 libxml2：i386 libxml2：amd64 libisc160：amd64 libdns162：amd64 libisccc140：amd64 libisccfg140：amd64 libbind9-140：amd64 liblwres141：amd64 bind9-host：amd64 dnsutils：amd64 openssl：amd64 ca-certificates：全部 libcurl3-gnutls：amd64 tcpdump：amd64 wget：amd64 python3-problem-report：全部 python3-apport：全部 apport：全部 apport-gtk：全部python 问题报告：全部 python apport：全部 apport-retrace：全部 bluez：amd64 bluez-cups：amd64 bluez-obexd：amd64 dnsmasq-base：amd64 libgdk-pixbuf2.0-common：全部 libgdk-pixbuf2.0-0：amd64 firefox：amd64 firefox-locale-en：amd64 libnss3-nssdb：全部 libnss3：amd64 libnss3-1d：amd64 libcurl3：amd64 flashplugin-installer：amd64 libgs9-common：全部 libgs9：amd64 ghostscript：amd64 ghostscript-x：amd64 gir1.2-gdkpixbuf-2.0：amd64 libjavascriptcoregtk-4.0-18：amd64 libwayland-客户端0：amd64 libwayland-服务器0：amd64 libwebkit2gtk-4.0-37：amd64 libwebkit2gtk-4.0-37-gtk2：amd64 gir1.2-javascriptcoregtk-4.0：amd64 gir1.2-webkit2-4.0：amd64 git-man：所有git：amd64 libbluetooth3：amd64 libgd3：i386 libgd3：amd64 libgraphite2-3：amd64 libmircore1：amd64 libmircommon7：amd64 libmirprotobuf3：amd64 libmirclient9：amd64 mysql-common：所有libmysqlclient20：i386 libplist3：amd64 libpoppler58：amd64 libpoppler-glib8：amd64 libwayland-cursor0：amd64 libxfont1：amd64 libxml2-utils：amd64 linux-firmware：全部 linux-image-4.4.0-98-generic：amd64 linux-image-extra-4.4.0-98-generic：amd64 linux-image-generic：amd64 linux-headers-4.4.0-98：全部 linux-headers-4.4.0-98-generic：amd64 linux-headers-generic：amd64 linux-generic：amd64 linux-signed-image-4.4.0-98-generic：amd64 linux-signed-image-generic：amd64 linux-signed-generic：amd64 linux-libc-dev：amd64 poppler-utils：amd64 python-jwt：全部 python-libxml2：amd64 python3-jwt：全部 qemu-user-static：amd64 texlive-base：全部 texlive-fonts-recommended：全部 texlive-latex-base：全部 texlive-latex-recommended：全部 texlive-generic-recommended：全部 thunderbird：amd64 thunderbird-locale-en：amd64 thunderbird-gnome-support：amd64 thunderbird-locale-en-gb：全部 thunderbird-locale-en-us：全部 wpasupplicant：amd64 xserver-common：全部 xserver-xorg-core：amd64 xul-ext-ubufox：全部 liblouis-data：全部 liblouis9：amd64 python3-louis：全部 /usr/bin/dpkg --status-fd 17 --configure --pending
是的，配置中启用了无人值守升级：
10周期：
APT::Periodic::更新包列表“1”； APT::Periodic::下载可升级包“0”； APT::周期::自动清洁间隔“0”；
20自动升级：
APT::Periodic::更新包列表“1”； APT::定期::无人值守升级“1”；
那么为什么无人值守升级没有安装任何升级？
要求的额外内容：
ls -l /var/lib/apt/periodic：
-rw-r--r-- 1 root root 0 十一月 16 18:49 下载可升级邮票 -rw-r--r-- 1 root root 0 11月17日 12:50 无人值守升级邮票 -rw-r--r-- 1 root root 0 十一月 16 18:47 更新戳 -rw-r--r-- 1 root root 0 11月17日 12:19 更新成功戳 -rw-r--r-- 1 root root 0 十月 3 11:18 升级戳
这是 /var/log/unattended-upgrades-dpkg.log 的全部内容：
日志开始时间：2017-11-17 12:10:41 日志结束时间：2017-11-17 12:10:42 日志开始时间：2017-11-17 12:25:57 日志结束时间：2017-11-17 12:25:58 日志开始时间：2017-11-17 12:50:53 日志结束时间：2017-11-17 12:50:54
所有这三个条目都是我手动运行“sudo unattended-upgrades --dry-run”得到的。
先前的 unattended-upgrades-dpkg.log.1.gz 包含以下内容：
日志开始时间：2017-10-03 11:18:26 ^MExtract 包中的模板：36%^MExtract 包中的模板：72%^MExtract 包中的模板：100% 预配置包... dpkg：错误：dpkg 状态数据库已被另一个进程锁定 日志结束时间：2017-10-03 11:18:27
请注意，这台计算机每天都会重新启动。上一个日志 unattended-upgrades-dpkg.log.2.gz 相当长，实际上显示了正在安装的内容。它以以下内容结尾：
找到 Linux 映像：/boot/vmlinuz-3.11.0-23-generic 找到 initrd 映像：/boot/initrd.img-3.11.0-23-generic 添加 EFI 固件配置的启动菜单条目 完毕 设置 linux-signed-image-generic (4.4.0.92.97) ... 设置 linux-signed-generic (4.4.0.92.97) ... 设置 linux-libc-dev:amd64 (4.4.0-92.115) ... 设置 xul-ext-ubufox (3.4-0ubuntu0.16.04.1) ... 处理 libc-bin (2.23-0ubuntu9) 的触发器... 日志结束时间：2017-08-21 10:29:14