Hey, > I used mysql and not mariadb.
well mysql is not in buster. mysql-5.5 is oldstable So using mysql can't be a supported case. I strongly encourage you to switch to mariadb! If you need to use mysql, than you find a workaround at the upstream bugreport: https://bugs.kde.org/show_bug.cgi?id=399346 > As I changed to sqlite3 I can't test with mariadb. So you get the error with sqlite3 backend? The sqlite3 backend is not recommended to be used in production. As sqlite3 lacks about many features of a proper sql database. > Some times ago I tested mariadb, but mariadb didn't start, I forget the exact message, but it complaned about unknown version 5.7. I'm using mariadb without issues for several years now. We had an issue with fresh installations, that was solved with 18.08.3-2. But without any concrete log messages I can't help. regards hefee
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