*** This bug is a duplicate of bug 1612517 ***
https://bugs.launchpad.net/bugs/1612517
The vanilla xenial -> bionic -> focal upgrade succeeded for me. mysql
was upgraded to 8.0, and the "query_cache*" parameters were removed from
my config file. The mysql-server service appears to be running without
error.
My suspicion is that there is a custom setting in your config making it
not a pure vanilla upgrade. This is actually a known issue, here:
https://bugs.launchpad.net/ubuntu/+source/mysql-8.0/+bug/1612517
I'm going to dupe this to that bug.
** This bug has been marked a duplicate of bug 1612517
Server fails to start after upgrade because of customized config and
obsolete/renamed directives
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https://bugs.launchpad.net/bugs/1920188
Title:
Failed to upgrade to mysql-server-8.0 when xenial-era config is
present
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