I've been having this bug since I installed the program rawstudio, with a launchpad ppa repository.
I've looked online and found an official solution for the problem: http://blog.launchpad.net/ppa/failed-to-fetch-errors-for-ppas
The thing is, in the files that they say we need to change, there aren't any launchpad entries, does anybody know what I need to do?
In case you need the info about the specific repository, it is: http://ppa.launchpad.net/rawstudio/ppa/ubuntu/dists/raring/main/binary-amd64/Packages http://ppa.launchpad.net/rawstudio/ppa/ubuntu/dists/raring/main/binary-i386/Packages
If I look into the address on the web, I can get to the dists directory, but the raring doesn't seem to exist. Should I change something so that it access the correct directory?