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Install / Uninstall gimp:
For Ubuntu 18.04, this PPA contains the most recent FFmpeg
libraries copied from Jonathon F's PPA.
https://launchpad.net/~jonathonf/+archive/ubuntu/ffmpeg-4
To install, run command:
sudo add-apt-repository ppa:ubuntuhandbook1/gimp
sudo apt update
sudo apt install gimp
To uninstall, run commands:
sudo apt install ppa-purge
sudo ppa-purge ppa:ubuntuhandbook1/gimp