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PPA Purge is a tiny tiny script (comes as a .deb) which a lot of Ubuntu users will love. We've actually covered it before, but it's now easier to install because PPA Purge is available via GetDeb.

So what is PPA Purge? Well, imagine you add a PPA repository which messes up a lot of stuff on your computer. PPA Purge can be used (with a single command) to remove that PPA, remove everything installed from that PPA and reinstall the original packages from the official Ubuntu repositories. Basically you have to use just ONE COMMAND for all these steps.

sudo ppa-purge PPA
where "PPA" is the PPA you want to purge, example:
sudo ppa-purge ppa:ubuntu-mozilla-daily/ppa

Sooner or later, everybody needs PPA Purge. But before using it, you must install it. Like I said, PPA Purge is now available in the GetDeb repository (only for Ubuntu 10.04 Lucid Lynx!) so make sure you add it to your sources.list (simply download and install this DEB file - it will add the Getdeb repository, add the key and so on).

Once you have the GetDeb repository added, simply run this:
sudo apt-get install ppa-purge

For Ubuntu 9.10 Karmic Koala, download THIS DEB file (although I think it's an older version).