我点击“安装更新”，然后它会说
需要安装不受信任的软件包
该操作将需要安装来自未经认证来源的软件包。
然后它会要求我关闭。这种情况发生在每一个更新。看来更新管理器弄巧成拙了。
详细信息部分很乱。它似乎列出了所有不起作用的更新，即全部：
0ad 0ad-data 0ad-data-common 活动日志管理器-common 活动日志管理器-控制中心 apparmor appmenu-gtk appmenu-gtk3 apport apport-gtk apport-symptoms apt apt-transport-https apt-utils aptdaemon aptdaemon-data bamfdaemon base-files bind9-host brasero brasero-cdrkit brasero-common busybox-initramfs busybox-static colord compiz compiz-core compiz-gnome compiz-plugins-default coreutils cups cups-bsd cups-client cups-common cups-ppdc dnsutils firefox firefox-globalmenu firefox-gnome-support firefox-locale-en flashplugin-installer gdb gimp gimp-data gir1.2-gtk-3.0 gir1.2-gudev-1.0 gir1.2-javascriptcoregtk-3.0 gir1.2-webkit-3.0 gnome-accessibility-themes gnome-control-center gnome-control-center-data gnome-power-manager gnome-settings-daemon gwibber gwibber-service gwibber-service-facebook gwibber-service-identica gwibber-service-twitter icedtea-7-jre-jamvm im-switch 指示器消息 指示器状态提供者-mc5 jockey-common jockey-gtk 景观客户端用户界面安装 libapt-inst1.4 libapt-pkg4.12 libavcodec53 libavdevice53 libavformat53 libavutil51 libbamf0 libbamf3-0 libbind9-80 libbrasero-media3-1 libc-bin libc-dev-bin libc6 libc6-dev libcolord1 libcups2 libcupscgi1 libcupsdriver1 libcupsimage2 libcupsmime1 libcupsppdc1 libdecoration0 libdns81 libfreerdp-plugins-standard libfreerdp1 libgail-3-0 libgimp2.0 libgl1-mesa-dri libgl1-mesa-glx libglapi-mesa libglu1-mesa libgnome-control-center1 libgtk-3-0 libgtk-3-bin libgtk-3-common libgudev-1.0-0 libgwibber-gtk2 libgwibber2 libindicator-messages-status-provider1 libisc83 libisccc80 libisccfg82 libjavascriptcoregtk-1.0-0 libjavascriptcoregtk-3.0-0 libldap-2.4-2 liblwres80 libnautilus-extension1a liboverlay-scrollbar-0.2-0 liboverlay-scrollbar3-0.2-0 libparted0debian1 libperl5.14 libpostproc52 libproxy1 libproxy1-plugin-gsettings libproxy1-plugin-networkmanager libpython3.2 libqt4-dbus libqt4-declarative libqt4-designer libqt4-help libqt4-network libqt4-opengl libqt4-script libqt4-scripttools libqt4-sql libqt4-sql-sqlite libqt4-svg libqt4-test libqt4-xml libqt4-xmlpatterns libqtcore4 libqtgui4 libssh-4 libswscale2 libtiff4 libudev0 libunity-core-5.0-5 libwebkitgtk-1.0-0 libwebkitgtk-1.0-common libwebkitgtk-3.0-0 libwebkitgtk-3.0-common libxatracker1 libxcb-composite0 libxcb-dri2-0 libxcb-glx0 libxcb-randr0 libxcb-render0 libxcb-shape0 libxcb-shm0 libxcb-xv0 libxcb1 libxml2 light-themes linux-generic-pae linux-headers-3.2.0-35 linux-headers-3.2.0-35-generic-pae linux-headers-generic-pae linux-image-3.2.0-35-generic-pae linux-image-generic-pae linux-libc-dev lsb-base lsb-release make multiarch-support nautilus nautilus-data openjdk-7-jre openjdk-7-jre-headless openjdk-7-jre-lib overlay-scrollbar parted perl perl-base perl-modules python-apport python-aptdaemon python-aptdaemon.gtk3widgets python-aptdaemon.pkcompat python-keyring python-libproxy python-libxml2 python-problem-report python-ubuntu-sso-client python3.2 python3。2-最小 qdbus 海马 thunderbird thunderbird-globalmenu thunderbird-gnome-support thunderbird-locale-en thunderbird-locale-en-us ubuntu-sso-client ubuntu-sso-client-gtk ubuntu-sso-client-qt udev unity unity-common unity-greeter unity-lens-applications unity-services update-notifier update-notifier-common xserver-xorg-input-wacom xul-ext-ubufox
请注意，即使对于 Ubuntu 更新也是如此。我检查了设置中的身份验证，似乎没有什么问题。
答案1
我刚刚遇到了同样的问题。我检查了设置，确保更新服务器是我想要的。有时，我发现更改服务器也有帮助。确保设置正确后，我单击“检查”。这会让计算机验证它是否已连接到服务器并具有适合我的机器的更新。最后一个按键是单击“安装更新”。更新像往常一样开始。希望这对你有帮助。
答案2
如果更新程序使用过期的缓存，则可能会发生这种情况。每次打开时，它似乎都会检查更新，但实际上除非您单击“检查”按钮，否则它不会执行 apt-get 更新。
这样我才意识到我没有互联网连接，而这正是问题的根本原因。