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When logging in with a new user in kde, if mariadb is installed, akonadi creates a user database with mariadb. If mariadb is later removed the kde panels hang on login for a minute or so as akonadi tries and fails to open the user database. The workaround I've come up with was to remove the database files.
According to a KDE developer akonadi should depend on mariadb (it's currently an optional dependency in arch).
Link to the discussion: https://discuss.kde.org/t/when-replacin … -bug/50325
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