Ошибка dpkg при установке gnome-session-fallback

Я пытался сделать sudo apt-get install gnome-session-fallback. Это результат, который я получаю:

(Reading database ... 353039 files and directories currently installed.)
Preparing to unpack .../gnome-panel-data_1%3a3.8.0-1ubuntu12.2_all.deb ...
Unpacking gnome-panel-data (1:3.8.0-1ubuntu12.2) ...
dpkg: error processing archive /var/cache/apt/archives/gnome-panel-data_1%3a3.8.0-1ubuntu12.2_all.deb (--unpack):
trying to overwrite '/usr/share/locale/mn/LC_MESSAGES', which is also in package language-selector-common 0.129.3
dpkg-deb: error: subprocess paste was killed by signal (Broken pipe)
Preparing to unpack .../gnome-applets-data_3.5.92-0ubuntu3_all.deb ...
Unpacking gnome-applets-data (3.5.92-0ubuntu3) ...
dpkg: error processing archive /var/cache/apt/archives/gnome-applets-data_3.5.92-0ubuntu3_all.deb (--unpack):
trying to overwrite '/usr/share/locale/mn/LC_MESSAGES', which is also in package language-selector-common 0.129.3
dpkg-deb: error: subprocess paste was killed by signal (Broken pipe)
Processing triggers for libglib2.0-0:i386 (2.40.2-0ubuntu1) ...
Processing triggers for libglib2.0-0:amd64 (2.40.2-0ubuntu1) ...
Processing triggers for hicolor-icon-theme (0.13-1) ...
Processing triggers for gconf2 (3.2.6-0ubuntu2) ...
Errors were encountered while processing:
 /var/cache/apt/archives/gnome-panel-data_1%3a3.8.0-1ubuntu12.2_all.deb
 /var/cache/apt/archives/gnome-applets-data_3.5.92-0ubuntu3_all.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)

Я попытался обновить и обновить:

Reading package lists... Done
Building dependency tree       
Reading state information... Done
You might want to run 'apt-get -f install' to correct these.
The following packages have unmet dependencies:
  gnome-applets : Depends: gnome-applets-data (>= 3.5) but it is not installed
             Depends: gnome-applets-data (< 3.6) but it is not installed
             Recommends: gnome-media but it is not installed
  gnome-panel : Depends: gnome-panel-data (= 1:3.8.0-1ubuntu12.2) but it is not installed
           Recommends: alacarte but it is not installed
E: Unmet dependencies. Try using -f.

, поэтому я попробовал sudo apt-get -f install, и я получил тот же результат, что и sudo apt-get install gnome-session-fallback. Я получил приглашение сообщить об этой ошибке на панели запуска. Любые решения?

Я также пытался установить aptitude (или любой другой пакет), я получаю это:

You might want to run 'apt-get -f install' to correct these:
The following packages have unmet dependencies:
 aptitude : Depends: aptitude-common (= 0.6.8.2-1ubuntu4) but it is not going to be installed
        Depends: libboost-iostreams1.54.0 but it is not going to be installed
        Depends: libcwidget3 but it is not going to be installed
        Depends: libept1.4.12 but it is not going to be installed
 gnome-applets : Depends: gnome-applets-data (>= 3.5) but it is not going to be installed
             Depends: gnome-applets-data (< 3.6) but it is not going to be installed
             Recommends: gnome-media but it is not going to be installed
 gnome-panel : Depends: gnome-panel-data (= 1:3.8.0-1ubuntu12.2) but it is not going to be installed
           Recommends: alacarte but it is not going to be installed
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).

Ручная установка файла deb aptitude из этой ошибки [!d3 ], дает следующее:

New sofware cant be installed because there is a problem with the software currently installed. Do you want to repair this porblem now? 

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