We currently support only Ubuntu Linux (related issue with Debian here ). We had no time to test with other distributions yet. Of course, if you find out what is going wrong, please let us know.
Please try again with the V2021-2 Linux AppImage. It should fix this issue.
This update adds official OpenSuse 15.2 support, Many (all?) other Linux flavors should work as well now. If you still encounter issues, please let us know.