The following packages will be upgraded:
  ktorrent
1 upgraded, 0 newly installed, 0 to remove and 41 not upgraded.
Need to get 2917kB of archives.
After unpacking 0B of additional disk space will be used.
Err http://fr.archive.ubuntu.com edgy-backports/main ktorrent 2.1-0ubuntu2~edgy1
  404 Not Found
Failed to fetch http://fr.archive.ubuntu.com/ubuntu/pool/main/k/ktorrent/ktorrent_2.1-0ubuntu2~edgy1_i386.deb  404 Not Found
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?


http://fr.archive.ubuntu.com/ubuntu/pool/main/k/ktorrent/ktorrent_2.1-0ubuntu2_i386.deb exists, but it's looking for ktorrent_2.1-0ubuntu2~edgy1_i386.deb