package mysql-server-5.7 5.7.12-0ubuntu1 failed to install/upgrade: 子进程 已安装 post-installation 脚本 返回错误状态 1

[LongSky]

after ubuntu 14.04 upgrade to ubuntu 16.04

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
NonfreeKernelModules: wl
ApportVersion: 2.20.1-0ubuntu2
Architecture: amd64
Date: Wed Apr 27 02:57:52 2016
ErrorMessage: 子进程 已安装 post-installation 脚本 返回错误状态 1
InstallationDate: Installed on 2013-11-09 (899 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
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: ['sys', 'wordpress', 'ib_buffer_pool', 'auto.cnf', 'cms', 'mysql_upgrade_info', 'ib_logfile0', 'debian-5.5.flag', 'ibdata1', 'ibtmp1', 'performance_schema', 'my_wiki', 'debian-5.7.flag', 'ib_logfile1', 'phpmyadmin', 'test', 'mainserver', 'mysql']
ProcCmdline: BOOT_IMAGE=/vmlinuz-4.4.0-21-generic root=UUID=ab4bc08d-2b7c-4fd8-96ef-91eb20aa51fc ro quiet splash nomdmonddf nomdmonisw nomdmonddf nomdmonisw nomdmonddf nomdmonisw nomdmonddf nomdmonisw 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: 子进程 已安装 post-installation 脚本 返回错误状态 1
UpgradeStatus: Upgraded to xenial on 2016-04-26 (0 days ago)