package mysql-server-5.7 5.7.17-0ubuntu0.16.04.2 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

[Ali SH]

Im not an expert so i don't know technical information.i was trying to upgrade mysql with update manager and it failed in installation or post installation.
ubuntu version : Ubuntu 16.04.2 LTS
package : mysql 5.7 5.7 17-ubuntu...

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: mysql-server-5.7 5.7.17-0ubuntu0.16.04.2
ProcVersionSignature: Ubuntu 4.8.0-46.49~16.04.1-generic 4.8.17
Uname: Linux 4.8.0-46-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.5
Architecture: amd64
Date: Fri Apr 7 12:55:48 2017
ErrorMessage: subprocess installed post-installation script returned error exit status 1
InstallationDate: Installed on 2017-02-20 (45 days ago)
InstallationMedia: Ubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64 (20170215.2)
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: ['sys', 'django_tutorial', 'ib_logfile1', 'mysql', 'auto.cnf', 'ibdata1', 'performance_schema', 'ib_logfile0', 'ib_buffer_pool', 'phpmyadmin', 'debian-5.7.flag', 'eghtesad_dan', 'ghresume_bot']
ProcCmdline: BOOT_IMAGE=/boot/vmlinuz-4.8.0-46-generic root=UUID=8c7347d4-6f59-4c4c-8bd1-8d2b14771ada ro quiet splash vt.handoff=7
RelatedPackageVersions:
 dpkg 1.18.4ubuntu1.1
 apt 1.2.19
SourcePackage: mysql-5.7
Title: package mysql-server-5.7 5.7.17-0ubuntu0.16.04.2 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
UpgradeStatus: No upgrade log present (probably fresh install)
upstart.mysql.override: manual

[Launchpad Janitor (janitor)]

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

[Joshua Powers (powersj)]

From log:

mysql_upgrade: Got error: 2002: Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2) while connecting to the MySQL server

Based on this I am going to dup this with: LP: #1592669 if you disagree please feel free to include additional information.