package mysql-server-5.5 5.5.54-0ubuntu0.14.04.1 failed to install/upgrade: subprocess new pre-installation script returned error exit status 1

[Ashish Kumar Paandey]

NA

ProblemType: Package
DistroRelease: Ubuntu 14.04
Package: mysql-server-5.5 5.5.54-0ubuntu0.14.04.1
ProcVersionSignature: Ubuntu 3.13.0-105.152-generic 3.13.11-ckt39
Uname: Linux 3.13.0-105-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.21
Architecture: amd64
Date: Sun Mar 5 12:06:44 2017
DuplicateSignature: package:mysql-server-5.5:5.5.54-0ubuntu0.14.04.1:subprocess new pre-installation script returned error exit status 1
ErrorMessage: subprocess new pre-installation script returned error exit status 1
InstallationDate: Installed on 2016-05-31 (278 days ago)
InstallationMedia: It
Logs.var.log.daemon.log:

MySQLConf.etc.mysql.conf.d..keepme:
MySQLConf.etc.mysql.conf.d.mysqld.safe.syslog.cnf:
 [mysqld_safe]
 syslog
MySQLVarLibDirListing: ['mysql', 'ib_logfile0', 'performance_schema', 'phpmyadmin', 'ibdata1', 'debian-5.5.flag', 'ib_logfile1', 'mysql_upgrade_info']
ProcCmdline: BOOT_IMAGE=/boot/vmlinuz-3.13.0-105-generic root=UUID=cd0524c2-a496-4ab4-9247-c2b308c8f69d ro quiet splash vt.handoff=7
RelatedPackageVersions:
 dpkg 1.17.5ubuntu5.7
 apt 1.0.1ubuntu2.15
SourcePackage: mysql-5.5
Title: package mysql-server-5.5 5.5.54-0ubuntu0.14.04.1 failed to install/upgrade: subprocess new pre-installation script returned error exit status 1
UpgradeStatus: Upgraded to trusty on 2016-08-27 (189 days ago)

[Nish Aravamudan (nacc)]

Hello and thank you for filing this bug report.

From DpkgTerminalLog.txt:

[?1049lAborting downgrade from (at least) 5.6 to 5.5.
If are sure you want to downgrade to 5.5, remove the file
/var/lib/mysql/debian-*.flag and try installing again.

Are you downgrading a MySQL installation?

[Launchpad Janitor (janitor)]

[Expired for mysql-5.5 (Ubuntu) because there has been no activity for 60 days.]