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The setting was written to the app.cfg file. You need to remove the "opengl_mode" and the following lines or delete/rename the file entirely. It will be restored with default setting again. Then start the game again.
You can find the location of that file by opening a terminal and typing following command into it:
find / -iname app.cfg 2>/dev/null
(it will search everywhere "/" for the name "app.cfg", ignoring upper/lower case ("i" in "iname"), error stream "2" will be redirected ">" to nirvana "/dev/null", basically ignoring all errors when searching)
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