Question #675990 on Yade changed:
https://answers.launchpad.net/yade/+question/675990
Status: Open => Answered
Vasileios Angelidakis proposed the following answer:
Hi Shen,
You can follow the instructions given here:
https://askubuntu.com/questions/307/how-can-ppas-be-removed
You can either do it through the terminal, or follow the answer including
screenshots on how to do it through the linux gui (way easier). You just need
to unclick the: http://ppa.launchpad.net/yade-users/external/ubuntu ppa.
Hope this helps,
Vasileios
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