Command-line Knowledge Base

Gparted

Change owner of folder where ext4 formatted device is mounted

To remove the PPA repository only

sudo add-apt-repository --remove ppa:repository-name/subdirectory
sudo apt update

To remove the PPA and downgrade*

*All packages installed from it back to the official distribution versions.

sudo apt install ppa-purge
sudo ppa-purge ppa:repository-name/subdirectory