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Dai,
I had to use command line to remove the ppa I found. Using just"point,click and delete" wouldn't allow me access to trash it. First I used $ ls -lh /etc/apt/sources.list.d Located the ppa file. Then I used $ sudo rm -Rf /etc/apt/sources.list.d/PPA_NAME.list to remove it. Then I ran apt-get update.Everything updated,...all is well..!
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You're welcome, if you are unsure about editing any of these files post here and I will help.
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