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

[Oscar]

Update the system Ubuntu 16.04 LTS

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: mysql-server-5.7 5.7.12-0ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
Uname: Linux 4.4.0-21-generic x86_64
ApportVersion: 2.20.1-0ubuntu2
Architecture: amd64
Date: Tue Apr 26 09:23:52 2016
ErrorMessage: subprocess installed post-installation script returned error exit status 1
InstallationDate: Installed on 2013-10-30 (908 days ago)
InstallationMedia: Ubuntu 12.04.3 LTS "Precise Pangolin" - Release amd64 (20130820.1)
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: ['ib_logfile1', 'movedb', 'ib_buffer_pool', 'Xiabre', 'performance_schema', 'prueba_ereda_2', 'ib_logfile0', 'dbara', 'phpmyadmin', 'dbMCP2new', 'torre1', 'Icex_Uruguay_PPEE', 'apperedav0', 'test', 'debian-5.6.flag', 'MedicineBow', 'Guijos_SGIPE', 'alarmas_4_exp.csv', 'mysql', 'prueba_oscar_2', 'MERRA', 'ibdata1', 'cacti', 'mysql_upgrade_info', 'alarmas_latella', 'alarmas_vratusa', 'debian-5.7.flag', 'Torres_Angola_3_Namibe', 'Guijos_WindOne', 'Majogazas_NEW', 'TMs_Autlan', 'prueba_oscar_1', 'auto.cnf', 'debian-5.5.flag', 'SerraPelata', 'dbborrarjuan', 'prueba', 'prueba_ereda']
ProcCmdline: BOOT_IMAGE=/boot/vmlinuz-4.4.0-21-generic.efi.signed root=UUID=72137c00-66e1-4281-9038-a5f664933e86 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 2016-04-05 (20 days ago)