package phpmyadmin 4:4.6.6-5 failed to install/upgrade: installed phpmyadmin package post-installation script subprocess returned error exit status 1

[Arbind]

I have just entered the command sudo apt update and sudo apt install phpmyadmin. Everything gone on it's own way but at last stage i got error.

ProblemType: Package
DistroRelease: Ubuntu 18.04
Package: phpmyadmin 4:4.6.6-5
ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
Uname: Linux 4.15.0-20-generic x86_64
ApportVersion: 2.20.9-0ubuntu7
Architecture: amd64
Date: Tue May 01 11:015:42 2018

Error Message : checking privileges on database phpmyadmin for phpmyadmin@localhost: user creation needed.
granting access to database phpmyadmin for phpmyadmin@localhost: failed.
error encountered creating user:
mysql said: ERROR 1819 (HY000) at line 1: Your password does not satisfy the current policy requirements
dbconfig-common: phpmyadmin configure: aborted.
dbconfig-common: flushing administrative password
dpkg: error processing package phpmyadmin (--configure):
 installed phpmyadmin package post-installation script subprocess returned error exit status 1
Processing triggers for libapache2-mod-php7.2 (7.2.3-1ubuntu1) ...
Errors were encountered while processing:
 phpmyadmin
E: Sub-process /usr/bin/dpkg returned an error code (1)

Error exit status 1

ProblemType: Package
DistroRelease: Ubuntu 18.04
Package: phpmyadmin 4:4.6.6-5
ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
Uname: Linux 4.15.0-20-generic x86_64
ApportVersion: 2.20.9-0ubuntu7
Architecture: amd64
Date: Tue May 1 23:23:09 2018
ErrorMessage: installed phpmyadmin package post-installation script subprocess returned error exit status 1
InstallationDate: Installed on 2018-04-28 (2 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
PackageArchitecture: all
Python3Details: /usr/bin/python3.6, Python 3.6.5, python3-minimal, 3.6.5-3
PythonDetails: /root/Error: command ['which', 'python'] failed with exit code 1:, Error: [Errno 2] No such file or directory: "/root/Error: command ['which', 'python'] failed with exit code 1:": "/root/Error: command ['which', 'python'] failed with exit code 1:", unpackaged
RelatedPackageVersions:
 dpkg 1.19.0.5ubuntu2
 apt 1.6.1
SourcePackage: phpmyadmin
Title: package phpmyadmin 4:4.6.6-5 failed to install/upgrade: installed phpmyadmin package post-installation script subprocess returned error exit status 1
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

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