I'm afraid this is leaving the realm of a bug report and entering one of
support.
The upgrade path in the code can be seen in /var/lib/dpkg/info/mysql-
server-5.7.postinst:
start_server "$mysql_statedir" "$tmpdir" "skip_grant" || result=$?
# If the server fails to start, then skip the various client operations
if [ $result -ne 0 ]; then
echo "Warning: Unable to start the server. Please restart MySQL and run
mysql_upgrade to ensure the database is ready for use." >&2
else
# mysql_upgrade returns exit status 2 if the database is already upgraded
# (LP: #1566406) so ignore its exit status if it is 2.
result=0
mysql_upgrade --no-defaults --socket="$tmpdir/mysqld.sock" || result=$?
if [ $result -ne 0 -a $result -ne 2 ]; then
echo "mysql_upgrade failed with exit status $result" >&2
stop_server "$tmpdir"
rm -rf "$tmpdir"
exit 1
fi
# Stop the server
stop_server "$tmpdir"
fi
I suppose you could try to replicate that mysql_upgrade command to see if you
can clear the upgrade status, or maybe add the suggested --force parameter and
try dpkg --configure -a again. And make sure there is no running mysql process.
That being said, if purging and starting over is an option for you, that
should also work. Just make sure you purge all packages (and not just
remove).
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https://bugs.launchpad.net/bugs/1817374
Title:
mysql-server-5.7 5.7.25 upgrade did not complete properly
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