Dev-mysql-maint error occurred during the installation of VHCS Control panel

Error message:

Can’t connect on ‘DBI:mysql:;localhost’ :Access denied for user ‘debian-sys-maint’@'localhost’ (using password: YES)

The issue occurring due to the absence of grant privilege (to the user dev-mysql-maint) on the databases.

You obtain details of "dev-mysql-maint" from /etc/mysql/debian.cnf.

One example is mentioned below:

# Automatically generated for Debian scripts. DO NOT TOUCH!
[client]
host = localhost
user = debian-sys-maint
password = 0nQp8g7pmupSbcpg
socket = /var/run/mysqld/mysqld.sock
[mysql_upgrade]
user = debian-sys-maint
password = 0nQp8g7pmupSbcpg
socket = /var/run/mysqld/mysqld.sock
basedir = /usr

You need to grant the privileges to dev-mysql-maint, according to the above information.

grant all privileges to *.* on 'dev-mysql-maint'@'localhost' identified by '0nQp8g7pmupSbcpg' with grant option;

Note: Modify the password according to the information in /etc/mysql/debian.cnf.