repository problems hardy

[phil2park2]

every time i try to update my computer, i get this message when the update installer reloads i get this message:

GPG error: http://deb.mulx.net hardy Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY B1F5957DE4946268Failed to fetch http://repoubuntusoftware.info/dists/harty/all/binary-amd64/Packages.gz 302 Found
Some index files failed to download, they have been ignored, or old ones used instead.

[Pumalite]

Edit your /etc/apt/sources.list and comment out the offending lines.
Post:

cat /etc/apt/sources.list