Here's a link that explains how to go back and forth from the nightlies (beta) and the stable version:
indilib.org/download.html

Start by uninstalling the nightly version
sudo apt-get install ppa-purge
sudo ppa-purge ppa:mutlaqja/indinightly

Then you may or may not need to reinstall the stable version:
sudo apt-add-repository ppa:mutlaqja/indinightly
sudo apt-get update
sudo apt-get install indi-full kstars-bleeding gsc

Good luck!
Scott

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