Ciao, sono su wheezy/sid. Il sources.list non saprei come controllarlo e/o aggiornarlo.

Questo è l'output di 'cat /etc/apt/sources.list':

# deb cdrom:[Kubuntu 13.04 _Raring Ringtail_ - Release amd64 (20130424)]/ raring main multiverse restricted universe
 
# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://archive.ubuntu.csg.uzh.ch/ubuntu/ raring main restricted
deb-src http://archive.ubuntu.csg.uzh.ch/ubuntu/ raring main restricted
 
## Major bug fix updates produced after the final release of the
## distribution.
deb http://archive.ubuntu.csg.uzh.ch/ubuntu/ raring-updates main restricted
deb-src http://archive.ubuntu.csg.uzh.ch/ubuntu/ raring-updates main restricted
 
## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team. Also, please note that software in universe WILL NOT receive any
## review or updates from the Ubuntu security team.
deb http://archive.ubuntu.csg.uzh.ch/ubuntu/ raring universe
deb-src http://archive.ubuntu.csg.uzh.ch/ubuntu/ raring universe
deb http://archive.ubuntu.csg.uzh.ch/ubuntu/ raring-updates universe
deb-src http://archive.ubuntu.csg.uzh.ch/ubuntu/ raring-updates 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://archive.ubuntu.csg.uzh.ch/ubuntu/ raring multiverse
deb-src http://archive.ubuntu.csg.uzh.ch/ubuntu/ raring multiverse
deb http://archive.ubuntu.csg.uzh.ch/ubuntu/ raring-updates multiverse
deb-src http://archive.ubuntu.csg.uzh.ch/ubuntu/ raring-updates multiverse
 
## 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://archive.ubuntu.csg.uzh.ch/ubuntu/ raring-backports main restricted universe multiverse
deb-src http://archive.ubuntu.csg.uzh.ch/ubuntu/ raring-backports main restricted universe multiverse
 
deb http://archive.ubuntu.csg.uzh.ch/ubuntu/ raring-security main restricted
deb-src http://archive.ubuntu.csg.uzh.ch/ubuntu/ raring-security main restricted
deb http://archive.ubuntu.csg.uzh.ch/ubuntu/ raring-security universe
deb-src http://archive.ubuntu.csg.uzh.ch/ubuntu/ raring-security universe
deb http://archive.ubuntu.csg.uzh.ch/ubuntu/ raring-security multiverse
deb-src http://archive.ubuntu.csg.uzh.ch/ubuntu/ raring-security multiverse
 
## Uncomment the following two lines to add software from Canonical's
## 'partner' repository.
## This software is not part of Ubuntu, but is offered by Canonical and the
## respective vendors as a service to Ubuntu users.
deb http://archive.canonical.com/ubuntu raring partner
deb-src http://archive.canonical.com/ubuntu raring partner
 
## This software is not part of Ubuntu, but is offered by third-party
## developers who want to ship their latest software.
deb http://extras.ubuntu.com/ubuntu raring main
deb-src http://extras.ubuntu.com/ubuntu raring main
deb http://download.tuxfamily.org/glxdock/repository/ubuntu raring cairo-dock
## deb http://download.tuxfamily.org/glxdock/repository/ubuntu raring cairo-dock
## deb http://download.tuxfamily.org/glxdock/repository/ubuntu raring cairo-dock
## deb http://download.tuxfamily.org/glxdock/repository/ubuntu raring cairo-dock