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[ubuntu] add-apt-repository does not edit sources.list

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linux-howto

http://ubuntuforums.org – When trying to add the Webupd8 Rhythmbox PPA to my system through sudo add-apt-repository ppa:webupd8/rhythmbox the command seems to work fine. Then i apt-get update and upgrade, and it shows no upgrade to be found. When i run sudo add-apt-repository -r ppa:webupd8/rhythmbox right afterward, it tells me it does not exist in any sources.list files. Does anybody know what is going on? P.S. - I have a ton of PPAs on my system. Is this part of the problem? (Hardware)