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Impossible d'installer lubuntu-desktop

J'essaye d'installer le paquet lubuntu-desktop.

user@Host:~$ Sudo apt-get install lubuntu-desktop

échoue avec cette erreur:

The following packages have unmet dependencies.
lubuntu-desktop : Depends: gdebi but it is not going to be installed
E: Unable to correct problems, you have held broken packages.

alors je procède avec

user@Host:~$ Sudo apt-get install gdebi

menant à

The following packages have unmet dependencies.
gdebi : Depends: gdebi-core (= 0.9.5.3ubuntu2) but 0.9.5.3ubuntu1 is to be installed
Recommends: libgtk2-Perl but it is not going to be installed
E: Unable to correct problems, you have held broken packages.

Je vais donc prendre ce paquetage libgtk2 - Perl, puis essayer à nouveau d’installer gdebi, menant à:

user@Host:~$ Sudo apt-get install gdebi
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies.
gdebi : Depends: gdebi-core (= 0.9.5.3ubuntu2) but 0.9.5.3ubuntu1 is to be installed    
E: Unable to correct problems, you have held broken packages.

Qu'est-ce qui ne va pas, mais surtout, comment corriger cela?

EDIT: ajout des informations demandées

GDEBI

user@Host:~$ Sudo apt-cache policy gdebi
gdebi:
     Installed: (none)
     Candidate: 0.9.5.3ubuntu2
     Version table:
     0.9.5.3ubuntu2 0
               500 http://it.archive.ubuntu.com/ubuntu/ trusty-proposed/universe                          AMD64 Packages
     0.9.5.3ubuntu1 0
               500 http://it.archive.ubuntu.com/ubuntu/ trusty-updates/universe AMD64 Packages
     0.9.5.3 0
              500 http://it.archive.ubuntu.com/ubuntu/ trusty/universe AMD64 Packages

GDEBI-CORE

user@Host:~$ Sudo apt-cache policy gdebi-core
gdebi-core:
       Installed: 0.9.5.3ubuntu1
       Candidate: 0.9.5.3ubuntu1
       Version table:
       *** 0.9.5.3ubuntu1 0
            500 http://it.archive.ubuntu.com/ubuntu/ trusty-updates/main AMD64 Packages
            100 /var/lib/dpkg/status
       0.9.5.3 0
            500 http://it.archive.ubuntu.com/ubuntu/ trusty/main AMD64 Packages
aptlubuntugdebi
3
qubex

Effectuez une mise à jour complète du système et réessayez:

Sudo apt-get update && Sudo apt-get upgrade && Sudo apt-get dist-upgrade
1
enedil