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[all variants] A note regarding PPA's...

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linux-howto

http://ubuntuforums.org – For New Users of Ubuntu... You may be tempted to go overboard trying out all sorts of things from various PPA's. But if you install something from a PPA, and decide you don't want it any more, you usually can't simply remove package X and call it day, because a lot of times, installing something from a PPA brings in a whole lot of other upgrades as dependencies. For example, a lot of people seem to like to try out Rico's Gnome Shell PPA, so they add ppa:ricotz/testing to their repos and install gnome-shell... But when you installed Gnome Shell from Rico's PPA, you will notice that the (Hardware)