Hi, > it was *not* my understanding that apt handled everything; i was > under the impression that authentication had to be reproduced > manually in the new mariadb, for instance. is this inaccurate?
It is so long ago I last saw a MySQL 8.0 instance that I don't recall the upgrade details, but in general upgrades from MySQL 5.5, 5.6, 5.7 and 8.0 start having more divergence, and in-place upgrades no longer work for 8.4+. I recommend taking a backup, restoring the backup to a test machine and trying it out before doing it in production.
