Upgrade to 7.04 from 6.10.17

[Emanuele Papini]

I have encounter this problem upgrading kubuntu from 6.10.17 to 7.04

Failed to fetch
http://security.ubuntu.com/ubuntu/dists/feisty-security/universe/binary-amd64/Packages.bz2subprocess
bzip2 returned error code (2)
Failed to fetch
http://security.ubuntu.com/ubuntu/dists/feisty-security/universe/binary-amd64/Packages.bz2subprocess
bzip2 returned error code (2)
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