I notice the following:
I add a ppa using
add-apt-repository, for example the wine ppa, mozilla security, nvidia drivers, etc..
When I go to the Update Manager and tell it to CHECK for updates it throws me a PPA error.
To solve the error I add the same PPA again.
Why do I have to add the PPA again (This also can be done by adding the received key alone with apt-key) but why does this problem happen anyway.
UPDATE - I have to add two small details.
First that removing the previous PPA that has the GPG problem and then adding it up again will have the same effect as adding it twice since adding it again (without removing it first) will overwrite the same PPA. But still in the end you would have to add it twice.
Second using the Update Manager (Clicking on the Settings Button and going to the Software Sources) to add the PPA has the same problem as adding it in the terminal. In both cases you have to add it twice. I can confirm this for Nvidia ppa, Mozilla Security ppa, Wine ppa and any other PPA I started trying in 11.10. I have to add that this issue was not a problem in 11.04. It started with 11.10. Somehow there is some minor details that trying to add a PPA the first time does not trigger the key for it. Doing it a second time triggers the key and you can use the Update Manager (or any other updater) without having a warning popup saying something about a PPA problem.
UPDATE 2 - I have tested several PPA. They all have the same problem adding them via the GUI
Software Sources or via the terminal
add-apt-repository. I have to actually add them, run the update command in terminal or via gui and then add them again to solve the problem. Does not matter from where I add them or update or add them again.