How can I fix a 404 Error using a PPA?
the command I gave was
sudo apt-get update && sudo apt-get upgrade
what I have to do? (I'm under kubuntu 11.10)
Seems like that you have added some extra repositories that no longer exit.
Remove this repositories:
Look for all lines containing a url to ppa.launchpad.net and comment them out by adding a '#' infront of the line.
Then try again.
Edit if you do not like vim and want to use you can use any other editor, maybe you'd like kedit for example:
procede to eliminate these ppa's :
(see Removing a PPA with ppa-purge)...