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many mysql server errors and installation problems on ubuntu 18.10, 19.04 and 19.10 belongs to apparmor which denied the access to mysqld.
a typical error is:
when looking in syslog after this mysqld error you will see the apparmor warnings in the log.
this problem can be solved with https://www.cqrlog.com/comment/7452#comment-7452
#correction auf apparmor so mysld access is not denied
the solution should be, that the installation of cqrlog already takes care for this entries in /etc/apparmor.d/local/usr.sbin.mysqld or it should be searched for a other solution.
maybe there was already a solution, because Petr mentioned this here: https://www.cqrlog.com/node/1706