hi, I tried to upgrade my amd64 laptop from wheezy to jessie, but apt-get upgrade fails with messages like: W: Failed to fetch http://ftp.fr.debian.org/debian/dists/jessie/main/binary-amd64/Packages Hash Sum mismatch I get that even with this very basic source.list: deb http://ftp.fr.debian.org/debian/ jessie main contrib non-free As jessie is supposed to be released at the end of April, I'd like to fix that before. best regards, -- Pierre Frenkiel