The following lines were added (+) and removed (-):
If you want to delete a PPA repository as well as all packages installed/upgraded from the PPA, you can use ppa-purge command, simultaneously this downgrading installed packages to the version from official mint base.If you want to delete a PPA repository as well as all packages installed/upgraded from the PPA, you can use "ppa-purge" command, simultaneously this downgrading installed packages to the version from official mint base. But to keep viewnoir after removing the repository do not "ppa-purge."