Hi. I have the Baduk-training program, Katrain, and today I resolved the engine from not working by installing needed libraries. Now I need to deal with another problem--the game freezes to the point of the OS saying it's not responding. I just installed 1.15 and would like to go back to 1.14 because it always worked; I installed 1.15 by pip. I think I need to remove all of 1.15, but don't know what to enter because the computer doesn't list it in Synaptic under Manually Installed and --purge katrain is a no-go too. If I can wipe out all of 1.15 and install a fresh copy of 1.14, I think it would work. If there's any other way of getting katrain to unfreeze and thus working, that would be great. Thanks.
Also asked at Katrain, Freezes after my move, OS warns of unresponsive prog - Ubuntu MATE - Ubuntu Community Hub
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pip uninstall <application_name> may help.
Also you might want to read about Python virtual environment. It allows install a program and its dependencies in a separate space so that core set of Python libraries remains clean.
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I no longer have problems with Katrain and now know how to install a specific version, with 1.14 being the case here: "pip3 install 'KaTrain==1.14.0' 'Kivy==2.3.0'"
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I'll just add a Thank You to @Anthony_Craig for marking here & the Ubuntu Discourse post as solved too. 
I (and no doubt others too) appreciate that.
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