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How can PPAs be removed using GUI?
February 4, 2018
Edited: June 12, 2020
November 24, 2022
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Remove PPAs with Ubuntu 16.04 LTS GUI
Select Software Settings -> Software & Updates -> Other Software:
Highlight the PPA you want to remove and click the Remove button.
Note that many PPA’s have two entries; one for the programs and one for the source code.
You should have an Internet connection before completing this operation because Ubuntu needs to update apt sources when you close the panel.
For more details see these Tecmint Instructions with many screen shots for both adding PPAs and removing PPAs.