package mariadb-server-10.0 10.0.29-0ubuntu0.16.04.1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 7

[Robert Shippey]

Trying to update to 16.04.2 LTS caused this error

package mariadb-server-10.0 10.0.29-0ubuntu0.16.04.1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 7

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: mariadb-server-10.0 10.0.29-0ubuntu0.16.04.1
ProcVersionSignature: Ubuntu 3.13.0-27.50-generic 3.13.11
Uname: Linux 3.13.0-27-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.5
Architecture: amd64
Date: Thu Apr 13 23:22:40 2017
ErrorMessage: subprocess installed post-installation script returned error exit status 7
InstallationDate: Installed on 2013-10-18 (1273 days ago)
InstallationMedia: Ubuntu-Server 13.10 "Saucy Salamander" - Release amd64 (20131016)
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
MySQLVarLibDirListing: ['aria_log.00000001', 'ib_logfile0', 'mysql_upgrade_info', 'rs_ibd', 'aria_log_control', 'mysql', 'debian-10.0.flag', 'ibd_events', 'ibdata1', 'wordpress', 'ib_logfile1', 'performance_schema']
ProcCmdline: root=LABEL=DOROOT ro
RelatedPackageVersions:
 dpkg 1.18.4ubuntu1.1
 apt 1.2.19
SourcePackage: mariadb-10.0
Title: package mariadb-server-10.0 10.0.29-0ubuntu0.16.04.1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 7
UpgradeStatus: Upgraded to xenial on 2017-04-13 (0 days ago)

[Faustin (fauust)]

Hi Robert,
thank you for reporting this.

Relevant error lines are:
170413 23:22:37 [ERROR] /usr/sbin/mysqld: unknown variable 'log-slow-queries=/var/log/mysql-slow-queries.log'
170413 23:22:37 [ERROR] Aborting

Can you verify where this variable is set?
$ sudo grep -r "log-slow-queries" /etc/mysql

Can you also explain us the steps that led to this?

[Launchpad Janitor (janitor)]

[Expired for mariadb-10.0 (Ubuntu) because there has been no activity for 60 days.]