package mysql-server 5.7.12-0ubuntu1 failed to install/upgrade: dependency problems - leaving unconfigured

[Giovanni G.]

Installation failed while configuring phpmyadmin

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: mysql-server 5.7.12-0ubuntu1
ProcVersionSignature: Ubuntu 4.2.0-35.40-generic 4.2.8-ckt5
Uname: Linux 4.2.0-35-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.20.1-0ubuntu2
Architecture: amd64
Date: Tue Apr 26 19:29:51 2016
ErrorMessage: dependency problems - leaving unconfigured
InstallationDate: Installed on 2014-02-27 (788 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
Logs.var.log.daemon.log:

MySQLConf.etc.mysql.conf.d.enablelog.cnf:
 [mysqld]
 general_log_file = /var/log/mysql/mysql.log
 general_log = 1
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-5.7.flag', 'ib_logfile0', 'mysql_upgrade_info', 'debian-5.5.flag', 'test', 'mysql', 'goh_protocol', 'asus-gg.log', 'performance_schema', 'ibdata1', 'estra', 'ib_buffer_pool', 'gg.log', 'ib_logfile1', 'debian-5.6.flag', 'auto.cnf', 'goh_work', 'phpmyadmin', 'xtrack']
PackageArchitecture: all
ProcCmdline: BOOT_IMAGE=/vmlinuz-4.2.0-35-generic.efi.signed root=/dev/mapper/vg-root ro quiet splash vt.handoff=7
RelatedPackageVersions:
 dpkg 1.18.4ubuntu1
 apt 1.2.10ubuntu1
SourcePackage: mysql-5.7
Title: package mysql-server 5.7.12-0ubuntu1 failed to install/upgrade: dependency problems - leaving unconfigured
UpgradeStatus: Upgraded to xenial on 2016-04-26 (0 days ago)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.