Comment 0 for bug 1610765

SYMPTOM
mysql fails to start

IMPACT
no sql for you

DIAGNOSE:
service mysql start
Job for mysql.service failed because the control process exited with error code. See "systemctl status mysql.service" and "journalctl -xe" for details.

- systemd has all sort of craziness going on so stop that
service mysql stop

- look at what apparmor is up to
tail -F /var/log/syslog | grep -i apparmor

- then start again
service mysql start

output is:
- mysql cannot read /etc/mysql
Aug 7 18:22:17 c505 kernel: [ 1485.490459] audit: type=1400 audit(1470619337.926:98): apparmor="DENIED" operation="open" profile="/usr/sbin/mysqld" name="/etc/mysql/my.cnf.migrated" pid=11219 comm="mysqld" requested_mask="r" denied_mask="r" fsuid=109 ouid=0

GET_AROUND:
sudo nano /etc/apparmor.d/usr.sbin.mysqld
line 25 after:
# Allow config access
  /etc/mysql/** r,
-add line:
  /etc/mysql/* r,

systemctl restart apparmor.service

service mysql stop
service mysql start

- problem is gone

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: mysql-server-5.7 5.7.13-0ubuntu0.16.04.2
ProcVersionSignature: Ubuntu 4.4.0-31.50-generic 4.4.13
Uname: Linux 4.4.0-31-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
Date: Sun Aug 7 18:31:32 2016
Logs.var.log.daemon.log:

MySQLConf.etc.mysql.conf.d.mysql.cnf: [mysql]
MySQLConf.etc.mysql.conf.d.mysqld_safe_syslog.cnf:
 [mysqld_safe]
 syslog
MySQLConf.etc.mysql.conf.d.mysqldump.cnf:
 [mysqldump]
 quick
 quote-names
 max_allowed_packet = 16M
MySQLConf.etc.mysql.mysql.conf.d.mysqld_safe_syslog.cnf:
 [mysqld_safe]
 syslog
MySQLVarLibDirListing: ['debian-5.0.flag', 'ib_buffer_pool', 'test', 'ib_logfile1', 'xpc21.err', 'auto.cnf', 'mysql_upgrade_info', 'bugzilla', 'zabbix', 'debian-5.5.flag', 'debian-5.1.flag', 'redmine_default', 'roundcube', 'ib_logfile0', 'ibtmp1', 'sys', 'mysql', 'ibdata1', 'bugs', 'debian-5.7.flag', 'owncloud', 'performance_schema']
ProcEnviron:
 SHELL=/bin/bash
 TERM=xterm
 PATH=(custom, user)
 LANG=en_US.UTF-8
 LANGUAGE=en_US.UTF-8
SourcePackage: mysql-5.7
UpgradeStatus: Upgraded to xenial on 2016-06-13 (56 days ago)
modified.conffile..etc.apparmor.d.usr.sbin.mysqld: [modified]
mtime.conffile..etc.apparmor.d.usr.sbin.mysqld: 2016-08-07T18:24:24.264357