Comment 3 for bug 1567884

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claus (claus2) wrote :

I had a similar (or the same error) today. I found this in my syslog:

Apr 8 18:51:25 mail mysqld[30197]: 2016-04-08T16:51:25.015211Z 0 [ERROR] unknown variable 'myisam-recover=BACKUP'
Apr 8 18:51:25 mail mysqld[30197]: 2016-04-08T16:51:25.015314Z 0 [ERROR] Aborting

And an older message:
Apr 8 18:45:01 mail mysqld: 2016-04-08 18:45:01 28781 [Warning] Using unique option prefix myisam-recover instead of myisam-recover-options is deprecated and will be removed in a future release. Please use the
full name instead.

For me disabling the line "myisam-recover=..." in /etc/mysql/mysql.conf.d/mysqld.cnf and rerunning apt-get upgrade fixed the problem.
HTH