Dear all, 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 So, when use apt-get update , i prevented to the following error: E: Release file expired, ignoring http://ftp.debian.org/archive/debian/20100820T150149Z/dists/sid/Release (invalid since 10d 4h 40min 14s) Then i use the following command and my problem was solved: aptitude -o 'Acquire::Check-Valid-Until=false' update Then i upgrade to sid! Now, Whenever i use apt-get update without above option , i get the given err,What's happen in my pc? How can i solve it forever? --mohsen
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