我使用 Lubuntu 12.04，并尝试在 Synaptic 中安装 lubuntu-restricted-extras。
它似乎卡在了某一点：当被要求接受一些用于字体的 Microsoft EULA（我猜）时，我按下了 Enter 键，但我觉得我什么也做不了，只能尝试关闭 synaptic，但我做不到，最后只好注销。
也许我不该这么做，但我却这么做了。
登录并重新启动后，不会启动任何安装，就好像 Synaptic 仍在工作一样。
问题似乎在于 lubuntu-restricted-extras 的安装不完整。
该怎么办呢？
当我输入
sudo dpkg --configure -a
我得到：
dpkg: error: dpkg status database is locked by another process
我发现这里我可以打字
sudo rm /var/lib/dpkg/lock
前
sudo dpkg --configure -a
然后更新（工作正常）并升级，此时我得到
$ sudo apt-get upgrade
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages have been kept back:
linux-generic linux-headers-generic linux-image-generic
The following packages will be upgraded:
accountsservice apparmor apport apport-gtk apt apt-transport-https apt-utils
aptdaemon aptdaemon-data audacious-plugins audacious-plugins-data base-files
bind9-host blueman cron cups cups-client cups-common cups-driver-gutenprint
cups-filters cups-ppdc dconf-gsettings-backend dconf-service
desktop-file-utils dmsetup dnsutils evince evince-common firefox-locale-en
fonts-liberation foomatic-filters ghostscript ghostscript-cups ghostscript-x
gir1.2-gtk-3.0 gir1.2-pango-1.0 glib-networking glib-networking-common
glib-networking-services gnome-icon-theme gnome-icon-theme-full grub-common
grub-pc grub-pc-bin grub2-common gstreamer0.10-plugins-base hdparm
initscripts isc-dhcp-client isc-dhcp-common jockey-common jockey-gtk
krb5-locales libaccountsservice0 libapt-inst1.4 libapt-pkg4.12 libasound2
libbind9-80 libcairo-gobject2 libcairo2 libcups2 libcupscgi1 libcupsfilters1
libcupsimage2 libcupsmime1 libcupsppdc1 libdbusmenu-glib4 libdbusmenu-gtk3-4
libdconf0 libdevmapper-event1.02.1 libdevmapper1.02.1 libdns81 libevince3-3
libexif12 libexpat1 libfm-data libfm-gtk-data libfm-gtk1 libfm1 libgail-3-0
libgcrypt11 libgl1-mesa-dri libgl1-mesa-glx libglade2-0 libglapi-mesa
libglib2.0-0 libglib2.0-bin libglib2.0-data libglu1-mesa libgnutls26
libgphoto2-2 libgphoto2-port0 libgrip0 libgs9 libgs9-common libgssapi-krb5-2
libgstreamer-plugins-base0.10-0 libgtk-3-0 libgtk-3-bin libgtk-3-common
libgudev-1.0-0 libgutenprint2 libisc83 libisccc80 libisccfg82
libjavascriptcoregtk-1.0-0 libjpeg-turbo8 libk5crypto3 libkrb5-3
libkrb5support0 liblaunchpad-integration-3.0-1
liblaunchpad-integration-common liblaunchpad-integration1 libldap-2.4-2
liblightdm-gobject-1-0 liblvm2app2.2 liblwres80 libmtp-common libmtp9
libnautilus-extension1a libnm-glib-vpn1 libnm-glib4 libnm-util2
libpango1.0-0 libperl5.14 libpolkit-agent-1-0 libpolkit-backend-1-0
libpolkit-gobject-1-0 libpulse-mainloop-glib0 libpulse0 libpurple0
libpython2.7 libsasl2-2 libsasl2-modules libsmbclient libsqlite3-0
libssl1.0.0 libtasn1-3 libtiff4 libudev0 libutouch-geis1 libv4l-0
libv4lconvert0 libwbclient0 libwebkitgtk-1.0-0 libwebkitgtk-1.0-common
libxatracker1 libxkbfile1 libxml2 libxslt1.1 lightdm lxkeymap nautilus-data
network-manager ntp ntpdate openssl perl perl-base perl-modules pidgin
pidgin-data policykit-1 printer-driver-gutenprint psmisc python-apport
python-aptdaemon python-aptdaemon.gtk3widgets python-cupshelpers python-gi
python-gobject python-libxml2 python-problem-report
python-software-properties python2.7 python2.7-minimal resolvconf
shared-mime-info simple-scan software-properties-common
software-properties-gtk ssl-cert sudo system-config-printer-common
system-config-printer-gnome sysv-rc sysvinit-utils ttf-mscorefonts-installer
udev udisks update-manager update-manager-core update-notifier
update-notifier-common upstart vim-common vim-tiny xkb-data xserver-common
xserver-xorg-core xserver-xorg-input-evdev xserver-xorg-input-synaptics
xserver-xorg-input-vmmouse xserver-xorg-video-intel
xserver-xorg-video-vmware
205 upgraded, 0 newly installed, 0 to remove and 3 not upgraded.
1 not fully installed or removed.
E: Could not get lock /var/cache/apt/archives/lock - open (11: Resource temporarily unavailable)
E: Unable to lock directory /var/cache/apt/archives/
Synaptic 可以打开，以前没有出现过这种情况。但是当我尝试在 Synaptic 中安装 lubuntu-restricted-extras 时，出现了以下情况：
E: Could not get lock /var/cache/apt/archives/lock - open (11: Resource temporarily unavailable) E: Unable to lock the download directory