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ORA-03113: end-of-file on communication channel

An Oracle server that had no maintenance for way too long, would not start the database anymore. Trying to start up the database gave an "ORA-03113: end-of-file on communication channel" error.
Some Googling led me to It described my problem and the solution(s) exactly, so I thought I'd share it here.

The output of the adrci "show alert" command looked like this in my case: