To remove PPA, you can either use Software Sources or Command Line terminal.
In Software sources, select the tab " Other Software" and choose the PPA to remove.
In command line terminal, you should have ppa-purge utility installed to disable/remove the PPA. To install ppa-purge type command :
sudo apt-get install ppa-purge
After this give the command :
sudo ppa-purge { ppa-package}
sudo apt-get update.
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