Hello people,

Each time I tape sudo apt-get update I get these error messages at the end:

W: Failed to fetch http://ppa.launchpad.net/and471/slickpanel-daily/ubuntu/dists/lucid/main/binary-i386/Packages.gz 404 Not Found

W: Failed to fetch http://ppa.launchpad.net/ubuntu-accomplishments/releases/ubuntu/dists/lucid/main/binary-i386/Packages.gz 404 Not Found

E: Some index files failed to download, they have been ignored, or old ones used instead.

Can you tell me why and how to fix them ?
I am using Ubuntu 11.10

Regards
Begueradj

Thank you very much for your answer, Rubberman

Thank you very much for your precise and smart answer, dear Marc Deop.

Best regards.