How can I fix a 404 Error using a PPA?
I have several PPAs in my package list.
Apparently, some of these are not accessible anymore after the last system upgrade.
Now when I update the update manager it tells me that it cannot update the remaining packages due to unavailability of the repositories.
Why is that happening and the application does not have a possibility to bypass the inaccessible packages? What can be done to re-enable the update manager's functionality?