package mysql-server-5.7 5.7.23-0ubuntu0.16.04.1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

[Aravind]

.

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: mysql-server-5.7 5.7.23-0ubuntu0.16.04.1
ProcVersionSignature: Ubuntu 4.4.0-131.157-generic 4.4.134
Uname: Linux 4.4.0-131-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.18
Architecture: amd64
Date: Tue Jul 31 01:09:08 2018
ErrorMessage: subprocess installed post-installation script returned error exit status 1
InstallationDate: Installed on 2017-07-10 (388 days ago)
InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
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', 'auto.cnf', 'ib_logfile0', 'debian-5.7.flag', 'ib_buffer_pool', 'performance_schema', 'mysql-bin.index', 'schooler_users', 'ib_logfile1', 'schooler', 'ibtmp1', 'mysql-bin.000001', 'mysql-bin.000002', 'mysql', 'ibdata1']
ProcCmdline: BOOT_IMAGE=/vmlinuz-4.4.0-131-generic root=UUID=9c344e13-42e5-43bd-a49c-0495a0065cde ro quiet splash vt.handoff=7
RelatedPackageVersions:
 dpkg 1.18.4ubuntu1.4
 apt 1.2.27
SourcePackage: mysql-5.7
Title: package mysql-server-5.7 5.7.23-0ubuntu0.16.04.1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
UpgradeStatus: Upgraded to xenial on 2017-07-10 (388 days ago)
upstart.mysql.override: manual

[Launchpad Janitor (janitor)]

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

[Andreas Hasenack (ahasenack)]

The logs show that mysql failed to start, but with no clear indication as of why.

Please provide clear steps to reproduce the problem.

In th emeantime, I suggest the following:

sudo apt update
sudo apt -f install

If the error persists, then please attach the terminal output again, and /var/log/mysql/error.log.

Thanks

[Launchpad Janitor (janitor)]

[Expired for mysql-5.7 (Ubuntu) because there has been no activity for 60 days.]