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.
The format of the lines in /etc/apt/ sources. list for PPAs has changed. They ppa.launchpad. net/5-a- day/ubuntu jaunty main ppa.launchpad. net/gwibber- daily/ppa/ ubuntu jaunty main
used to look like:
deb http://
but now look like:
deb http://
See how it now says "/ppa/ubuntu" not just "/ubuntu"? I think that's your
problem.