GringoNyiss egy konzolt:
sudo cp /etc/apt/sources.list /etc/apt/sources.bak
utána:
sudo gedit /etc/apt/sources.list
Törölj ki mindent, és tedd be helyette ezt:
#########################
deb http://archive.ubuntu.com/ubuntu feisty main restricted
deb-src http://archive.ubuntu.com/ubuntu feisty main restricted
## Uncomment the following two lines to add software from the 'universe'
## repository.
## 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://archive.ubuntu.com/ubuntu feisty universe
deb-src http://archive.ubuntu.com/ubuntu feisty universe
deb http://security.ubuntu.com/ubuntu feisty-security main restricted
deb-src http://security.ubuntu.com/ubuntu feisty-security main restricted
#########################
Ments, lépj ki, majd sudo apt-get update
Aztán meglátjuk, ad-e vissza hibát.