On Thu 01 Dec 2011 at 22:17:20 +0330, Mohsen Pahlevanzadeh wrote: > I installed squeeze and at first empty /etc/apt/sources.list and then > put the following line in that: > deb http://ftp.debian.org/debian sid main contrib non-free Any reason why you are using ftp.debian.org as an archive? Was it offered as a mirror when you installed Squeeze?