##PPA
add-apt-repository ppa:zentyal/3.2
add-apt-repository --remove ppa:zentyal/3.2
You might have noticed that in all the above three methods we only talked about deleting or removing a PPA. What about the applications installed using these PPAs? Will they be removed as a result of removing the PPA? The answer is NO. So this is when PPA purge comes in picture. It not only removes the PPA but also uninstalls all the programs installed by the PPA.
Install ppa-purge by using the following command:
sudo apt-get install ppa-purge
Now use it in following manner to purge the PPA:
sudo ppa-purge ppa-url
The URL of the PPA can be found in the Software Sources list.