Não consigo instalar usando gnome-app-install e nem atualizar

[jbaojunior]

 Sempre que escolho um pacote para instalar com o adicionar/remover e clica para instalar, ela não instal e volta a recarregar os pacotes. Sempre que eu abro ele com o terminal e faço isso da a seguinte mensagem:


junior@junior-desktop:/etc/apt$ gnome-app-install
** (gnome-app-install:7783): WARNING **: return value of custom widget handler was not a GtkWidget
/usr/lib/python2.5/site-packages/AppInstall/AppInstall.py:1532: GtkWarning: gtk_tree_model_sort_sort: assertion `tree_model_sort->default_sort_func != NULL' failed
  item.applications.set_default_sort_func(None)
No protocol specified


Quando coloco na frente sudo gnome-app-install vai mas a mensagem continua:

junior@junior-desktop:/etc/apt$ sudo gnome-app-install
warning: could not initiate dbus

** (gnome-app-install:8016): WARNING **: return value of custom widget handler was not a GtkWidget
/usr/lib/python2.5/site-packages/AppInstall/AppInstall.py:1532: GtkWarning: gtk_tree_model_sort_sort: assertion `tree_model_sort->default_sort_func != NULL' failed
  item.applications.set_default_sort_func(None)


Tinham 3 pacotes para eu atualizar e pela update-manager eu não conseguia. Acontecia a mesma coisa: colocava aplicar e ele carregava as atualizações de novo

Vou colocar meu sources.list para possíveis problemas contido nele. Se bem que eu num achei nenhum.
# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.

deb http://br.archive.ubuntu.com/ubuntu/ feisty main restricted
deb-src http://br.archive.ubuntu.com/ubuntu/ feisty restricted main multiverse universe #Added by software-properties

## Major bug fix updates produced after the final release of the
## distribution.
deb http://br.archive.ubuntu.com/ubuntu/ feisty-updates main restricted
deb-src http://br.archive.ubuntu.com/ubuntu/ feisty-updates main restricted #Added by software-properties

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team, and may not be under a free licence. Please satisfy yourself as to
## your rights to use the software. Also, please note that software in
## universe WILL NOT receive any review or updates from the Ubuntu security
## team.
deb http://br.archive.ubuntu.com/ubuntu/ feisty universe

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team, and may not be under a free licence. Please satisfy yourself as to
## your rights to use the software. Also, please note that software in
## multiverse WILL NOT receive any review or updates from the Ubuntu
## security team.
deb http://br.archive.ubuntu.com/ubuntu/ feisty multiverse

## Uncomment the following two lines to add software from the 'backports'
## repository.
## N.B. software from this repository may not have been tested as
## extensively as that contained in the main release, although it includes
## newer versions of some applications which may provide useful features.
## Also, please note that software in backports WILL NOT receive any review
## or updates from the Ubuntu security team.
# deb http://br.archive.ubuntu.com/ubuntu/ feisty-backports main restricted universe multiverse
# deb-src http://br.archive.ubuntu.com/ubuntu/ feisty-backports main restricted universe multiverse

deb http://security.ubuntu.com/ubuntu feisty-security main restricted
deb-src http://security.ubuntu.com/ubuntu feisty-security restricted main multiverse universe #Added by software-properties
deb http://security.ubuntu.com/ubuntu feisty-security universe
deb http://archive.ubuntu.com/ubuntu/ feisty-proposed restricted main multiverse universe
deb-src http://archive.ubuntu.com/ubuntu/ feisty-proposed restricted main multiverse universe #Added by software-properties
deb http://archive.ubuntu.com/ubuntu/ feisty-updates restricted main multiverse universe
deb-src http://archive.ubuntu.com/ubuntu/ feisty-updates restricted main multiverse universe #Added by software-properties
deb http://archive.ubuntu.com/ubuntu/ feisty-backports restricted main multiverse universe
deb-src http://archive.ubuntu.com/ubuntu/ feisty-backports restricted main multiverse universe #Added by software-properties
deb http://security.ubuntu.com/ubuntu feisty-security multiverse


#AUTOMATIX REPOS START

deb http://www.getautomatix.com/apt feisty main

deb http://archive.canonical.com/ubuntu feisty-commercial main

deb http://archive.ubuntu.com/ubuntu feisty-security main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu feisty-security main restricted universe multiverse #Added by software-properties
#AUTOMATIX REPOS END

O problema esta com o phyton 2.5?

Por favor pessoal da uma ajuda ai!!!!!!

[pinduvoz]

Use pelo terminal o comando

sudo apt-get update

Se houver um erro no apt ele vai aparecer e basta postar a saída do comando (e o erro) aqui para podermos saber do que se trata.

Caso não haja erro no update do apt pode haver uma falha no pacote gnome-app-install. Então, basta tentar reinstala-lo pelo Synaptic para ver se problema acaba.