我将 trusty(14.04) ppa 添加到我的 12.04 中，以便安装 python3-progressbar。成功安装 python3-progressbar 后。我用它apt-get install synaptic来安装 synaptic 包。（使用我的 source.list 中的 trusty ppa。它安装了许多 14.04 包并删除了许多 12.04 包。
在完成 synaptic 包的安装之前发生了一个错误。每次我使用该命令时apt-get install synaptic都会出现以下错误消息：
$sudo apt-get install synaptic
Reading package lists... Done
Building dependency tree
Reading state information... Done
synaptic is already the newest version.
You might want to run 'apt-get -f install' to correct these:
The following packages have unmet dependencies:
aptdaemon : Depends: python3-aptdaemon (= 1.1.1-1ubuntu5) but it is not installable
Depends: python3-gi but it is not going to be installed
Recommends: lintian but it is not going to be installed
gnome-power-manager : Depends: libpango-1.0-0 (>= 1.18.0) but it is not installable
Depends: gnome-settings-daemon-schemas (>= 3.2) but it is not installable
gnome-screensaver : Depends: libsystemd-login0 (>= 31) but it is not installable
indicator-power : Depends: liburl-dispatcher1 (>= 0.1) but it is not installable
Recommends: unity-control-center but it is not installable or
gnome-control-center (>= 3.1) but it is not going to be installed or
ubuntu-system-settings but it is not installable or
xfce4-power-manager but it is not going to be installed
indicator-session : Depends: systemd-services but it is not installable
Depends: gnome-settings-daemon-schemas but it is not installable
Recommends: unity-control-center but it is not installable or
gnome-control-center but it is not going to be installed
Recommends: unity-control-center-signon but it is not installable or
gnome-control-center-signon but it is not installable
libc-dev-bin : Depends: libc6 (> 2.19) but 2.15-0ubuntu10.10 is to be installed
libc6-dev : Depends: libc6 (= 2.19-0ubuntu6) but 2.15-0ubuntu10.10 is to be installed
libgail-3-0 : Depends: libpango-1.0-0 (>= 1.32.4) but it is not installable
libglib2.0-0 : Depends: libc6 (>= 2.17) but 2.15-0ubuntu10.10 is to be installed
libglib2.0-bin : Depends: libelfg0 (>= 0.8.12) but it is not going to be installed
libglib2.0-dev : Depends: libpcre3-dev (>= 1:8.31) but 8.12-4 is to be installed
libgtk-3-0 : Depends: libpango-1.0-0 (>= 1.32.4) but it is not installable
libp11-kit0 : Depends: libc6 (>= 2.16) but 2.15-0ubuntu10.10 is to be installed
libpango1.0-0 : Depends: libpango-1.0-0 (= 1.36.3-1ubuntu1) but it is not installable
Depends: libpangoxft-1.0-0 (= 1.36.3-1ubuntu1) but it is not installable
Depends: libpangox-1.0-0 (>= 0.0.2-2~) but it is not installable
libpangocairo-1.0-0 : Depends: libpango-1.0-0 (>= 1.32.4) but it is not installable
libpangoft2-1.0-0 : Depends: libpango-1.0-0 (>= 1.36.0) but it is not installable
libudev1 : Depends: libc6 (>= 2.17) but 2.15-0ubuntu10.10 is to be installed
libxkbcommon0 : Depends: libc6 (>= 2.17) but 2.15-0ubuntu10.10 is to be installed
nautilus : Depends: libpango-1.0-0 (>= 1.20.0) but it is not installable
python-apt : Depends: libapt-inst1.5 (>= 0.8.11) but it is not installable
Depends: libapt-pkg4.12 (>= 0.9.11) but 0.8.16~exp12ubuntu10.22 is to be installed
python-gi : Depends: libgirepository-1.0-1 (>= 1.33.10) but 1.32.0-1 is to be installed
Depends: gir1.2-glib-2.0 (>= 1.35.9) but 1.32.0-1 is to be installed
unity-greeter : Depends: libido3-0.1-0 (>= 13.10.0daily13.06.19) but 0.3.4-0ubuntu1 is to be installed
Depends: liblightdm-gobject-1-0 (>= 1.4.0) but 1.2.3-0ubuntu2.5 is to be installed
Depends: libpango-1.0-0 (>= 1.14.0) but it is not installable
Recommends: unity-settings-daemon but it is not installable
Recommends: indicator-datetime but it is not going to be installed
Recommends: indicator-keyboard but it is not installable
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).
deb http://us.archive.ubuntu.com/ubuntu trusty main universe然后，我删除了etc/apt/source.list 中的行。完成此操作后，我sudo apt-get -f install按照建议运行命令。它给出以下输出：
Reading package lists... Done
Building dependency tree
Reading state information... Done
Correcting dependencies... Done
The following packages were automatically installed and are no longer required:
libopencc1 python-libproxy libical0 python-keyring dnsmasq-base espeak libnet-ssleay-perl iputils-tracepath folks-common libmtp9 libyaml-tiny-perl libnl-3-200 libpth20 laptop-detect
libbrlapi0.5 python-twisted-bin python-sphinx python-mako python-pastedeploy python-configglue libnux-2.0-common libwmf0.2-7 intel-gpu-tools libraw5 libprotobuf7 libdiscid0 libmtp-runtime
liburi-perl dnsutils fonts-opensymbol libhtml-parser-perl sphinx-doc libhyphen0 python-piston-mini-client python-louis liblouis-data libglew1.6 libhttp-daemon-perl syslinux-legacy
libexttextcat0 libcrypt-passwdmd5-perl ubuntu-extras-keyring git-man libpython3.4 gnome-menus empathy-common python-speechd python-egenix-mxtools docutils-common
python-ubuntuone-storageprotocol mobile-broadband-provider-info python-launchpadlib libx86-1 libfont-afm-perl python-zope.interface libhttp-negotiate-perl guile-1.8-libs python-oauth
libfile-listing-perl libhtml-form-perl libwps-0.2-2 syslinux-common libdotconf1.0 python-lxml gnome-control-center-data python-twisted-web python-pyinotify libsigc++-2.0-0c2a
libfile-desktopentry-perl libexttextcat-data libthai-data python-serial toshset transmission-common python-debtagshw libpcrecpp0 duplicity python-protobuf libhtml-tree-perl libdatrie1
libencode-locale-perl libportaudio2 vbetool libhttp-date-perl python-pam libmailtools-perl libcairomm-1.0-1 libjs-underscore apg python-scgi libnetfilter-conntrack3 command-not-found-data
python-brlapi uno-libs3 libnl-genl-3-200 libnm-gtk-common libhttp-cookies-perl libsonic0 libhttp-message-perl liblouis2 iputils-arping libnfnetlink0 x11-xfs-utils libgtksourceview-3.0-common
python-docutils espeak-data python-problem-report libnl-route-3-200 libfile-basedir-perl python-paste libssl-doc libwpd-0.9-9 apport-symptoms libnet-http-perl sphinx-common libthai0
libminiupnpc8 remmina-common ibus-pinyin-db-android im-switch python-twisted-core xdg-utils liberror-perl xinit python-simplejson libespeak1 libhtml-format-perl libfs6 ure docutils-doc
libdecoration0 python-twisted-names libexiv2-11 libmtp-common python-lazr.uri libsocket6-perl python-gdbm zenity-common python-formencode ubuntu-wallpapers libwnck-common libyajl1 libsysfs2
xfonts-mathml libgpgme11 python-markupsafe evolution-data-server-common protobuf-compiler libhtml-tagset-perl libboost-serialization1.46.1 radeontool libevent-2.0-5 libzephyr4 libmhash2
libwacom-common nux-tools python-dirspec libwpg-0.2-2 libfreerdp1 python-xkit python-roman python-jinja2 libssh-4 python-egenix-mxdatetime libglewmx1.6 python-lazr.restfulclient python-lockfile
python-wadllib libprotoc7 iptables libwww-robotrules-perl liblwp-mediatypes-perl librsync1 libgoa-1.0-common python-dateutil python-crypto adium-theme-ubuntu activity-log-manager-common
dmidecode libmng1 gir1.2-javascriptcoregtk-3.0 libmythes-1.2-0 libjs-sphinxdoc libio-socket-inet6-perl python-openid libelfg0 python3.2 python3.2-minimal
Use 'apt-get autoremove' to remove them.
The following extra packages will be installed:
libelfg0 libgl1-mesa-glx libglapi-mesa python3.2 python3.2-minimal
Suggested packages:
python3.2-doc binfmt-support
The following packages will be REMOVED:
accountsservice acpi-support acpid activity-log-manager-control-center adduser aisleriot alsa-base alsa-utils anacron apparmor appmenu-gtk appmenu-gtk3 appmenu-qt apport apport-gtk
apt-transport-https apt-xapian-index aptdaemon apturl apturl-common at at-spi2-core avahi-autoipd avahi-daemon avahi-utils bamfdaemon baobab bluez bluez-alsa bluez-cups bluez-gstreamer brasero
brasero-cdrkit brasero-common brltty build-essential checkbox checkbox-qt colord command-not-found compiz-core compiz-plugins-default compiz-plugins-main-default compizconfig-backend-gconf
console-setup consolekit cron cryptsetup-bin cups cups-bsd cups-client cups-filters cups-ppdc dbus dbus-x11 dconf-gsettings-backend dconf-service deja-dup desktop-file-utils dmsetup doc-base
e2fsprogs eject empathy enchant evince evince-common evolution-data-server file-roller firefox firefox-gnome-support friendly-recovery ftp fuse g++ g++-4.6 gcalctool gconf-service
gconf-service-backend gconf2 gedit gedit-common geoclue geoclue-ubuntu-geoip gettext ghostscript ghostscript-cups ghostscript-x ginn gir1.2-appindicator3-0.1 gir1.2-atk-1.0 gir1.2-atspi-2.0
gir1.2-dbusmenu-glib-0.4 gir1.2-dbusmenu-gtk-0.4 gir1.2-dee-1.0 gir1.2-freedesktop gir1.2-gdkpixbuf-2.0 gir1.2-glib-2.0 gir1.2-gmenu-3.0 gir1.2-gnomebluetooth-1.0 gir1.2-gnomekeyring-1.0
gir1.2-gst-plugins-base-0.10 gir1.2-gstreamer-0.10 gir1.2-gtk-2.0 gir1.2-gtk-3.0 gir1.2-gtksource-3.0 gir1.2-gudev-1.0 gir1.2-indicate-0.7 gir1.2-launchpad-integration-3.0 gir1.2-notify-0.7
gir1.2-pango-1.0 gir1.2-peas-1.0 gir1.2-rb-3.0 gir1.2-soup-2.4 gir1.2-totem-1.0 gir1.2-totem-plparser-1.0 gir1.2-unity-5.0 gir1.2-vte-2.90 gir1.2-webkit-3.0 gir1.2-wnck-3.0 git gksu
glib-networking glib-networking-services gnome-bluetooth gnome-disk-utility gnome-font-viewer gnome-games-data gnome-icon-theme gnome-icon-theme-symbolic gnome-keyring gnome-media gnome-nettool
gnome-online-accounts gnome-orca gnome-power-manager gnome-screensaver gnome-screenshot gnome-session-bin gnome-session-canberra gnome-session-common gnome-sudoku gnome-system-log
gnome-system-monitor gnome-terminal gnome-terminal-data gnome-user-guide gnome-user-share gnomine grub-common grub-gfxpayload-lists grub-pc grub-pc-bin grub2-common gs-cjk-resource
gsettings-desktop-schemas gstreamer0.10-alsa gstreamer0.10-gconf gstreamer0.10-nice gstreamer0.10-plugins-base gstreamer0.10-plugins-base-apps gstreamer0.10-plugins-good
gstreamer0.10-pulseaudio gstreamer0.10-tools gstreamer0.10-x gtk2-engines gtk2-engines-murrine gtk3-engines-unico gucharmap gvfs gvfs-backends gvfs-bin gvfs-common gvfs-daemons gvfs-fuse
gvfs-libs gwibber gwibber-service gwibber-service-facebook gwibber-service-identica gwibber-service-twitter hostname hplip humanity-icon-theme ibus ibus-gtk ibus-gtk3 ibus-pinyin ibus-table
ifupdown indicator-application indicator-appmenu indicator-messages indicator-power indicator-printers indicator-session indicator-sound indicator-status-provider-mc5 initramfs-tools
initscripts intltool irqbalance jockey-common jockey-gtk kbd kerneloops-daemon keyboard-configuration landscape-client-ui-install language-selector-common language-selector-gnome
libaccountsservice0 libappindicator1 libappindicator3-1 libatk-adaptor libatk-adaptor-schemas libatk-bridge2.0-0 libatk1.0-0 libatkmm-1.6-1 libatspi2.0-0 libaudio2 libavahi-glib1
libavahi-gobject0 libavahi-ui-gtk3-0 libbamf0 libbamf3-0 libblkid1 libbrasero-media3-1 libc-dev-bin libc6-dev libcairo-gobject2 libcamel-1.2-29 libcanberra-gtk-module libcanberra-gtk0
libcanberra-gtk3-0 libcanberra-gtk3-module libcanberra-pulse libcmis-0.2-0 libcolord1 libcompizconfig0 libcroco3 libcryptsetup4 libcups2 libcupscgi1 libcupsdriver1 libcupsfilters1 libcupsimage2
libcupsmime1 libcupsppdc1 libcurl3 libcurl3-gnutls libcurl3-nss libdbus-glib-1-2 libdbusmenu-glib4 libdbusmenu-gtk3-4 libdbusmenu-gtk4 libdbusmenu-qt2 libdconf-dbus-1-0 libdconf-qt0 libdconf0
libdee-1.0-4 libdevmapper-event1.02.1 libdevmapper1.02.1 libdmapsharing-3.0-2 libebackend-1.2-1 libebook-1.2-12 libecal-1.2-10 libedata-book-1.2-11 libedata-cal-1.2-13 libedataserver-1.2-15
libedataserverui-3.0-1 libegl1-mesa-drivers-lts-trusty libegl1-mesa-lts-trusty libenchant1c2a libevince3-3 libexpat1-dev libfarstream-0.1-0 libfile-mimeinfo-perl libfolks-eds25
libfolks-telepathy25 libfolks25 libfreerdp-plugins-standard libgail-3-0 libgail-common libgail18 libgbm1-lts-trusty libgck-1-0 libgconf-2-4 libgconf2-4 libgcr-3-1 libgdata13 libgdk-pixbuf2.0-0
libgdu-gtk0 libgdu0 libgee2 libgeoclue0 libgettextpo0 libgexiv2-1 libgirepository-1.0-1 libgksu2-0 libgl1-mesa-dri-lts-trusty libgl1-mesa-glx-lts-trusty libglamor-ltst0 libglapi-mesa-lts-trusty
libglib-perl libglib2.0-0 libglib2.0-bin libglib2.0-dev libglibmm-2.4-1c2a libgmime-2.6-0 libgnome-bluetooth8 libgnome-control-center1 libgnome-desktop-3-7 libgnome-keyring0
libgnome-media-profiles-3.0-0 libgnome-menu-3-0 libgnome-menu2 libgnome2-common libgnomekbd-common libgnomekbd7 libgnutls26 libgoa-1.0-0 libgphoto2-2 libgpod-common libgpod4 libgrip0 libgs9
libgssdp-1.0-3 libgstreamer-plugins-base0.10-0 libgstreamer0.10-0 libgtk-3-0 libgtk-3-bin libgtk-3-common libgtk2-perl libgtk2.0-0 libgtk2.0-bin libgtkmm-3.0-1 libgtksourceview-3.0-0
libgtkspell-3-0 libgtop2-7 libgucharmap-2-90-7 libgudev-1.0-0 libgupnp-1.0-4 libgupnp-igd-1.0-4 libgweather-3-0 libgweather-common libgwibber-gtk2 libgwibber2 libharfbuzz0b libibus-1.0-0
libido3-0.1-0 libimobiledevice2 libindicate-gtk3 libindicate5 libindicator-messages-status-provider1 libindicator3-7 libindicator7 libio-socket-ssl-perl libjavascriptcoregtk-3.0-0
libjson-glib-1.0-0 liblaunchpad-integration-3.0-1 libldap-2.4-2 liblightdm-gobject-1-0 liblvm2app2.2 liblwp-protocol-https-perl libmeanwhile1 libmetacity-private0 libmission-control-plugins0
libmount1 libmusicbrainz3-6 libnautilus-extension1a libneon27-gnutls libnice10 libnm-glib-vpn1 libnm-glib4 libnm-gtk0 libnm-util2 libnotify-bin libnotify4 libnss-mdns libnux-2.0-0 liboauth0
libopenvg1-mesa-lts-trusty liboverlay-scrollbar-0.2-0 liboverlay-scrollbar3-0.2-0 libp11-kit0 libpackagekit-glib2-14 libpango-perl libpango1.0-0 libpangocairo-1.0-0 libpangoft2-1.0-0
libpangomm-1.4-1 libparted0debian1 libpcre3-dev libpeas-1.0-0 libpolkit-agent-1-0 libpolkit-backend-1-0 libpolkit-gobject-1-0 libpoppler-glib8 libpopt-dev libproxy1-plugin-gsettings
libpulse-mainloop-glib0 libpurple-bin libpurple0 libpython3.4-dev libqt4-dbus libqt4-declarative libqt4-network libqt4-opengl libqt4-script libqt4-sql libqt4-sql-sqlite libqt4-svg libqt4-xml
libqt4-xmlpatterns libqtbamf1 libqtcore4 libqtdee2 libqtgconf1 libqtgui4 libquvi7 libraptor2-0 librasqal3 librdf0 libreoffice-base-core libreoffice-calc libreoffice-common libreoffice-core
libreoffice-draw libreoffice-emailmerge libreoffice-gnome libreoffice-gtk libreoffice-help-en-us libreoffice-impress libreoffice-math libreoffice-style-human libreoffice-style-tango
libreoffice-writer librest-0.7-0 librhythmbox-core5 librsvg2-2 librsvg2-common librtmp0 libsane libsane-hpaio libsm6 libsmbclient libsoup-gnome2.4-1 libsoup2.4-1 libspectre1 libspeechd2
libssl-dev libstdc++6-4.6-dev libsyncdaemon-1.0-1 libtelepathy-farstream2 libtelepathy-glib0 libtelepathy-logger2 libtimezonemap1 libtool libtotem-plparser17 libtotem0 libudev1 libunique-3.0-0
libunity-2d-private0 libunity-core-5.0-5 libunity-misc4 libunity9 libupower-glib1 libutempter0 libuuid-perl libuuid1 libvncserver0 libvte-2.90-9 libvte9 libwacom2
libwayland-egl1-mesa-lts-trusty libwebkitgtk-3.0-0 libwmf0.2-7-gtk libwnck-3-0 libwnck22 libwww-perl libxapian22 libxatracker2-lts-trusty libxaw7 libxkbcommon0 libxklavier16 libxml-parser-perl
libxmu6 libxt6 libyelp0 libzeitgeist-1.0-1 light-themes lightdm linux-generic-lts-trusty linux-image-3.13.0-32-generic linux-image-3.13.0-45-generic linux-image-generic-lts-trusty
linux-sound-base logrotate mahjongg media-player-info metacity metacity-common mlocate modemmanager module-init-tools mount mountall mousetweaks nautilus nautilus-data nautilus-sendto
nautilus-sendto-empathy nautilus-share netbase netcat-openbsd network-manager network-manager-gnome network-manager-pptp network-manager-pptp-gnome notify-osd ntfs-3g ntpdate nvidia-common
obex-data-server obexd-client onboard oneconf openssh-client overlay-scrollbar parted passwd pkg-config plymouth plymouth-label plymouth-theme-ubuntu-logo plymouth-theme-ubuntu-text pm-utils
policykit-1 policykit-1-gnome powermgmt-base ppp pppconfig pppoeconf pptp-linux printer-driver-c2esp printer-driver-foo2zjs printer-driver-gutenprint printer-driver-hpcups
printer-driver-pnm2ppa printer-driver-ptouch printer-driver-sag-gdi printer-driver-splix procps pulseaudio pulseaudio-module-bluetooth pulseaudio-module-gconf pulseaudio-module-x11
pulseaudio-utils python-appindicator python-apport python-apt python-aptdaemon python-aptdaemon.gtk3widgets python-cups python-cupshelpers python-dbus python-dev python-distutils-extra
python-gconf python-gi python-gi-cairo python-gnomekeyring python-gobject python-gobject-2 python-gst0.10 python-gtk2 python-ibus python-notify python-packagekit python-pyatspi2 python-pycurl
python-smbc python-software-properties python-ubuntu-sso-client python-ubuntuone-client python-ubuntuone-control-panel python-uno python-virtkey python-xapian python-zeitgeist python2.7-dev
python3.4-dev qdbus qt-at-spi remmina remmina-plugin-rdp remmina-plugin-vnc resolvconf rfkill rhythmbox rhythmbox-data rhythmbox-mozilla rhythmbox-plugin-cdrecorder rhythmbox-plugin-magnatune
rhythmbox-plugin-zeitgeist rhythmbox-plugins rhythmbox-ubuntuone rsyslog rtkit samba-common-bin sane-utils seahorse session-migration sessioninstaller shared-mime-info shotwell simple-scan
smbclient sni-qt software-center software-center-aptdaemon-plugins software-properties-common software-properties-gtk speech-dispatcher ssh-askpass-gnome ssl-cert synaptic syslinux
system-config-printer-common system-config-printer-gnome system-config-printer-udev telepathy-gabble telepathy-haze telepathy-idle telepathy-indicator telepathy-logger
telepathy-mission-control-5 telepathy-salut telnet thunderbird thunderbird-gnome-support totem totem-common totem-mozilla totem-plugins transmission-gtk ubuntu-artwork ubuntu-docs
ubuntu-minimal ubuntu-mono ubuntu-sso-client ubuntu-sso-client-gtk ubuntu-standard ubuntu-system-service ubuntuone-client ubuntuone-control-panel ubuntuone-couch ubuntuone-installer udev udisks
ufw unattended-upgrades unity-2d unity-2d-common unity-2d-panel unity-2d-shell unity-2d-spread unity-asset-pool unity-common unity-greeter unity-lens-applications unity-lens-files
unity-lens-music unity-lens-video unity-scope-musicstores unity-scope-video-remote unity-services update-manager update-manager-core update-notifier update-notifier-common upower upstart
ureadahead usb-creator-common usb-creator-gtk usb-modeswitch usb-modeswitch-data usbmuxd util-linux uuid-dev uuid-runtime vino whoopsie wpasupplicant x11-apps x11-session-utils x11-utils
x11-xkb-utils x11-xserver-utils x11-xserver-utils-lts-trusty xdg-user-dirs-gtk xdiagnose xorg xserver-common xserver-common-lts-trusty xserver-xorg-core-lts-trusty
xserver-xorg-input-all-lts-trusty xserver-xorg-input-evdev-lts-trusty xserver-xorg-input-mouse-lts-trusty xserver-xorg-input-synaptics-lts-trusty xserver-xorg-input-vmmouse-lts-trusty
xserver-xorg-input-wacom-lts-trusty xserver-xorg-lts-trusty xserver-xorg-video-all-lts-trusty xserver-xorg-video-ati-lts-trusty xserver-xorg-video-cirrus-lts-trusty
xserver-xorg-video-fbdev-lts-trusty xserver-xorg-video-glamoregl-lts-trusty xserver-xorg-video-intel-lts-trusty xserver-xorg-video-mach64-lts-trusty xserver-xorg-video-mga-lts-trusty
xserver-xorg-video-modesetting-lts-trusty xserver-xorg-video-neomagic-lts-trusty xserver-xorg-video-nouveau-lts-trusty xserver-xorg-video-openchrome-lts-trusty
xserver-xorg-video-r128-lts-trusty xserver-xorg-video-radeon-lts-trusty xserver-xorg-video-s3-lts-trusty xserver-xorg-video-savage-lts-trusty xserver-xorg-video-siliconmotion-lts-trusty
xserver-xorg-video-sis-lts-trusty xserver-xorg-video-sisusb-lts-trusty xserver-xorg-video-tdfx-lts-trusty xserver-xorg-video-trident-lts-trusty xserver-xorg-video-vesa-lts-trusty
xserver-xorg-video-vmware-lts-trusty xterm xul-ext-ubufox yelp zeitgeist zeitgeist-core zeitgeist-datahub zenity zlib1g-dev
The following NEW packages will be installed:
libelfg0 libgl1-mesa-glx libglapi-mesa python3.2 python3.2-minimal
WARNING: The following essential packages will be removed.
This should NOT be done unless you know exactly what you are doing!
e2fsprogs libblkid1 (due to e2fsprogs) libuuid1 (due to e2fsprogs) util-linux (due to e2fsprogs) hostname mount libmount1 (due to mount)
0 upgraded, 5 newly installed, 745 to remove and 34 not upgraded.
69 not fully installed or removed.
Need to get 4,471 kB of archives.
After this operation, 1,718 MB disk space will be freed.
You are about to do something potentially harmful.
To continue type in the phrase 'Yes, do as I say!'
我完全被这个输出搞晕了。手动安装所有这些包是不可能的。事实上，我无法安装一个包，它总是给我未满足的依赖警告，命令apt-get install无法完成。我想这可能是因为包管理系统试图安装所有新包（14.04），就像升级我的操作系统一样，然而，这个过程崩溃了。在这种情况下如何恢复到纯 12.04。