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

[Removed by request]

I am installing mysql server in my ubuntu 16.04. I installed xampp which is collection of apache and mysql. It worked fine for few days. But one day I tried to start the server but I was not able to start mysql server. Apache started fine but not mysql. So does any one know how to fix it. I am not able to figure it out. I reinstalled it but problem stays there.

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: mysql-server-5.7 5.7.23-0ubuntu0.16.04.1
ProcVersionSignature: Ubuntu 4.15.0-29.31~16.04.1-generic 4.15.18
Uname: Linux 4.15.0-29-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.18
Architecture: amd64
Date: Fri Aug 3 20:09:10 2018
ErrorMessage: subprocess installed post-installation script returned error exit status 1
InstallationDate: Installed on 2018-08-01 (2 days ago)
InstallationMedia: Ubuntu 16.04.4 LTS "Xenial Xerus" - Release amd64 (20180228)
KernLog:

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: ['ib_buffer_pool', 'ibdata1', 'ibtmp1', 'mysql', 'performance_schema', 'ib_logfile1', 'ib_logfile0', 'debian-5.7.flag', 'auto.cnf', 'sys']
ProcCmdline: BOOT_IMAGE=/boot/vmlinuz-4.15.0-29-generic root=UUID=8e3845b1-5501-4338-945e-f57d860427be 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: No upgrade log present (probably fresh install)

[Joshua Powers (powersj)]

Thank you for taking the time to file a bug report.

To my knowledge xampp is not found in the ubuntu archive. If it is causing or having issues then you need to contact the upstream xampp developers. From the mysql log it seems the last entry shows it correctly starting.

Since it seems likely to me that this is a local configuration problem,
rather than a bug in Ubuntu, I am marking this bug as 'Incomplete'.

However, if you believe that this is really a bug in Ubuntu, then we would
be grateful if you would provide a more complete description of the problem
with steps to reproduce, explain why you believe this is a bug in Ubuntu
rather than a problem specific to your system, and then change the bug
status back to "New".

For local configuration issues, you can find assistance here:
http://www.ubuntu.com/support/community

[Launchpad Janitor (janitor)]

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