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I'm not aware of a number limit, but I do know that as you add more PPAs, you get more twisted and twisted dependency chains and PPAs can/will begin to conflict with each other. You should only add a PPA if you really need/want what's in it. I, for example, have the webupd8 PPA for ST and a couple of other things, X-Swat, and Kernel edgers. If someone ...


It is appropriate job for uniq which omits duplicate lines and prints only unique entries, thus we can take output of uniq and replace old file with uniq's output: sort /etc/apt/sources.list | uniq > /tmp/sources && sudo mv /tmp/sources /etc/apt/sources.list

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