Comment 33 for bug 334446

The format of the lines in /etc/apt/sources.list for PPAs has changed. They
used to look like:
deb http://ppa.launchpad.net/5-a-day/ubuntu jaunty main
but now look like:
deb http://ppa.launchpad.net/gwibber-daily/ppa/ubuntu jaunty main

See how it now says "/ppa/ubuntu" not just "/ubuntu"? I think that's your
problem.