To uninstall mgdiff just follow these instructions.
sudo apt-get remove mgdiff
This will remove just the mgdiff package itself.
sudo apt-get remove --auto-remove mgdiff
This will remove the mgdiff package and any other dependant packages which are no longer needed.
If you also want to delete your local/config files for mgdiff then this will work.
sudo apt-get purge mgdiff
Or similarly, like this mgdiff
sudo apt-get purge --auto-remove mgdiff
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