How have you ended up with a repository for Ubuntu 6.10 (edgy) in your sources ?
You've done the right thing .. that repo needed disabling.
(or at the very least adjusting for "raring" .. if you're on Peppermint 4)
That's most definitely NOT a default repository .. it can't be considered a Peppermint "bug" if it's not part of Peppermint
