package mysql-server-5.7 5.7.12-0ubuntu1.1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

[df28]

-package mysql-server-5.7 5.7.12-0ubuntu1.1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: mysql-server-5.7 5.7.12-0ubuntu1.1
ProcVersionSignature: Ubuntu 4.4.0-28.47-generic 4.4.13
Uname: Linux 4.4.0-28-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
Date: Fri Jul 1 17:55:18 2016
ErrorMessage: subprocess installed post-installation script returned error exit status 1
InstallationDate: Installed on 2016-03-02 (120 days ago)
InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
KernLog:
 [74827.532245] audit: type=1400 audit(1467388505.725:35): apparmor="STATUS" operation="profile_replace" profile="unconfined" name="/usr/sbin/mysqld" pid=901 comm="apparmor_parser"
 [74831.558780] audit: type=1400 audit(1467388509.749:36): apparmor="STATUS" operation="profile_replace" profile="unconfined" name="/usr/sbin/mysqld" pid=972 comm="apparmor_parser"
 [74975.234687] SGI XFS with ACLs, security attributes, realtime, no debug enabled
 [75037.778285] audit: type=1400 audit(1467388715.966:37): apparmor="STATUS" operation="profile_replace" profile="unconfined" name="/usr/sbin/mysqld" pid=25805 comm="apparmor_parser"
 [75038.214102] audit: type=1400 audit(1467388716.402:38): apparmor="STATUS" operation="profile_replace" profile="unconfined" name="/usr/sbin/mysqld" pid=25833 comm="apparmor_parser"
Logs.var.log.daemon.log:

MySQLConf.etc.mysql.conf.d.mysql.cnf: [mysql]
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: ['ib_buffer_pool', 'ib_logfile1', 'mysql', 'ibdata1', 'sys', 'mysql_upgrade_info', 'sologne-Veriton.err', 'performance_schema', 'ib_logfile0', '28300', 'debian-5.6.flag', 'debian-5.7.flag', 'auto.cnf']
ProcCmdline: BOOT_IMAGE=/boot/vmlinuz-4.4.0-28-generic root=UUID=fb77a6d9-7d08-4071-a7f9-3fca75fbae10 ro quiet splash vt.handoff=7
RelatedPackageVersions:
 dpkg 1.18.4ubuntu1.1
 apt 1.2.12~ubuntu16.04.1
SourcePackage: mysql-5.7
Title: package mysql-server-5.7 5.7.12-0ubuntu1.1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
UpgradeStatus: No upgrade log present (probably fresh install)
modified.conffile..etc.init.mysql.conf: [modified]
modified.conffile..etc.mysql.mysql.cnf: [modified]
modified.conffile..etc.mysql.mysql.conf.d.mysqld.cnf: [modified]
mtime.conffile..etc.init.mysql.conf: 2016-06-09T19:37:25.047418
mtime.conffile..etc.mysql.mysql.cnf: 2016-04-21T08:58:55.910064
mtime.conffile..etc.mysql.mysql.conf.d.mysqld.cnf: 2016-06-09T19:30:49.311715