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viewnoir can edit and save which I don't need in an "image viewer."viewnoir can edit and save which I don't need in an "image viewer." You can remove the repository without uninstalling viewnoir (I don't necessarily want other software from skellat, but if you do, then leave it. add-apt-repository --remove ppa:skellat/flow1If 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.