package mysql-hostname-5.6 5.6.28-0ubuntu0.15.04.1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

hello
error after upgrade
Sergey Kiselev

ProblemType: Package
DistroRelease: Ubuntu 15.04
Package: mysql-server-5.6 5.6.28-0ubuntu0.15.04.1
ProcVersionSignature: Ubuntu 3.19.0-51.58-lowlatency 3.19.8-ckt13
Uname: Linux 3.19.0-51-lowlatency x86_64
ApportVersion: 2.17.2-0ubuntu1.8
Architecture: amd64
Date: Sun Apr 10 14:31:54 2016
DpkgHistoryLog:
 Start-Date: 2016-04-10 14:20:46
 Commandline: aptdaemon role='role-commit-packages' sender=':1.74'
 Upgrade: webmin:amd64 (1.780, 1.791), linux-libc-dev:amd64 (3.19.0-49.55, 3.19.0-58.64)
DuplicateSignature: package:mysql-server-5.6:5.6.28-0ubuntu0.15.04.1:subprocess installed post-installation script returned error exit status 1
ErrorMessage: subprocess installed post-installation script returned error exit status 1
InstallationDate: Installed on 2015-08-25 (229 days ago)
InstallationMedia: Ubuntu-Studio 15.04 "Vivid Vervet" - Release amd64 (20150422)
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: ['onlyoffice', 'mysql_upgrade_info', 'mysql', 'ib_logfile0', 'debian-5.6.flag', 'performance_schema', 'ibdata1', 'phpmyadmin', 'ib_logfile1', 'auto.cnf']
ProcCmdline: BOOT_IMAGE=/boot/vmlinuz-3.19.0-51-lowlatency root=UUID=448a36b9-3a87-4bbd-99cd-6cfbd81b5b34 ro quiet splash vt.handoff=7
RelatedPackageVersions:
 dpkg 1.17.25ubuntu1.1
 apt 1.0.9.7ubuntu4.2
SourcePackage: mysql-5.6
Title: package mysql-hostname-5.6 5.6.28-0ubuntu0.15.04.1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
UpgradeStatus: No upgrade log present (probably fresh install)