Eu tenho as seguintes entradas, no meu arquivo /etc/apt/sources.list:
deb http://us.archive.ubuntu.com/ubuntu/ saucy main restricted
deb-src http://us.archive.ubuntu.com/ubuntu/ saucy main restricted
## Major bug fix updates produced after the final release of the
## distribution.
deb http://us.archive.ubuntu.com/ubuntu/ saucy-updates main restricted
deb-src http://us.archive.ubuntu.com/ubuntu/ saucy-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://us.archive.ubuntu.com/ubuntu/ saucy universe
deb-src http://us.archive.ubuntu.com/ubuntu/ saucy universe
deb http://us.archive.ubuntu.com/ubuntu/ saucy-updates universe
deb-src http://us.archive.ubuntu.com/ubuntu/ saucy-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://us.archive.ubuntu.com/ubuntu/ saucy multiverse
deb-src http://us.archive.ubuntu.com/ubuntu/ saucy multiverse
deb http://us.archive.ubuntu.com/ubuntu/ saucy-updates multiverse
deb-src http://us.archive.ubuntu.com/ubuntu/ saucy-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://us.archive.ubuntu.com/ubuntu/ saucy-backports main restricted universe multiverse
deb-src http://us.archive.ubuntu.com/ubuntu/ saucy-backports main restricted universe multiverse
deb http://security.ubuntu.com/ubuntu/ saucy-security main restricted
deb-src http://security.ubuntu.com/ubuntu/ saucy-security main restricted
deb http://security.ubuntu.com/ubuntu/ saucy-security universe
deb-src http://security.ubuntu.com/ubuntu/ saucy-security universe
deb http://security.ubuntu.com/ubuntu/ saucy-security multiverse
deb-src http://security.ubuntu.com/ubuntu/ saucy-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/ saucy partner
deb-src http://archive.canonical.com/ubuntu/ saucy 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/ saucy main
deb-src http://extras.ubuntu.com/ubuntu/ saucy main
Você deve copiar isso em seu arquivo /etc/apt/sources.lust e jogar o que você tinha antes. Você pode, talvez, adaptar os repositórios regionais (nós ...) para o seu país, mas isso ainda funcionará mesmo na forma atual. Além disso, aqui você encontrará o skype.