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

[robin]

sorry, no idea what happened. apport generated and reported this without much of my input, or even awareness there was a problem with mysql

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: mysql-server-5.7 5.7.11-0ubuntu6
ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
Uname: Linux 4.4.0-21-generic i686
ApportVersion: 2.20.1-0ubuntu2
Architecture: i386
Date: Mon Apr 25 18:16:14 2016
ErrorMessage: subprocess installed post-installation script returned error exit status 1
InstallationDate: Installed on 2014-11-06 (542 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release i386 (20140722.2)
Logs.var.log.daemon.log:

Logs.var.log.mysql.error.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: ['ibtmp1', 'ib_logfile0', 'performance_schema', 'sys', 'debian-5.5.flag', 'ib_buffer_pool', 'auto.cnf', 'mysql_upgrade_info', 'debian-5.7.flag', 'ibdata1', 'mysql', 'my_wiki', 'ib_logfile1']
ProcCmdline: BOOT_IMAGE=/boot/vmlinuz-4.4.0-21-generic root=UUID=1cd8605f-123b-451a-9bba-8b8de22d9674 ro quiet splash vt.handoff=7
RelatedPackageVersions:
 dpkg 1.18.4ubuntu1
 apt 1.2.10ubuntu1
SourcePackage: mysql-5.7
Title: package mysql-server-5.7 5.7.12-0ubuntu1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
UpgradeStatus: Upgraded to xenial on 2016-04-25 (6 days ago)

[Robie Basak (racb)]

From log:

Setting up mysql-server-5.7 (5.7.11-0ubuntu6) ...
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 ...
update-alternatives: using /etc/mysql/mysql.cnf to provide /etc/mysql/my.cnf (my.cnf) in auto mode
mysql start/running, process 5120
Checking if update is needed.
Checking server version.
Running queries to upgrade MySQL server.
mysql_upgrade: [ERROR] 1050: Table 'cond_instances' already exists
mysql_upgrade failed with exit status 5
dpkg: error processing package mysql-server-5.7 (--configure):
 subprocess installed post-installation script returned error exit status 1

[Robie Basak (racb)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. I think this is a likely symptom (that we haven't seen before) of bug 1577712, so I'll mark it as a duplicate for now.