This may be the relevant log entry:

Setting up mysql-server-5.6 (5.6.25-0ubuntu0.15.04.1) ...
Installing new version of config file /etc/apparmor.d/usr.sbin.mysqld ...
Installing new version of config file /etc/init.d/mysql ...
Installing new version of config file /etc/init/mysql.conf ...
Installing new version of config file /etc/logrotate.d/mysql-server ...
Installing new version of config file /etc/mysql/debian-start ...
2015-10-07 10:32:08 0 [Warning] Using unique option prefix key_buffer instead 
of key_buffer_size is deprecated and will be removed in a future release. 
Please use the full name instead.
2015-10-07 10:32:08 0 [Warning] options --log-slow-admin-statements, 
--log-queries-not-using-indexes and --log-slow-slave-statements have no effect 
if --slow-query-log is not set
2015-10-07 10:32:08 0 [Warning] TIMESTAMP with implicit DEFAULT value is 
deprecated. Please use --explicit_defaults_for_timestamp server option (see 
documentation for more details).

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https://bugs.launchpad.net/bugs/1503609

Title:
  upgrader looped because of mysql problem

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