[Ubuntu] Access denied for user ‘debiansysmaint’@'localhost’ (using password: YES)

I have reinstalled my system to Ubuntu 12.04, after installed mysql, i found that there is an error when start mysql: 

Access denied for user ‘debian-sys-maint’@'localhost’ (using password: YES) 

After searching the reason via google, i at last found the reason, here is it:

That’s because debian has a mysql account for switching on/off and checking mysql status, and mysql password for that user “debian-sys-maint” should be the same stored in /etc/mysql/debian.cnf

here is the way to resolve it.

1. check the password in /etc/mysql/debian.cnf

sudo vim /etc/mysql/debian.cnf

you will see something like these:

[client]
host     = localhost
user     = debian-sys-maint
password = your-password-here
socket   = /var/run/mysqld/mysqld.sock
[mysql_upgrade]
host     = localhost
user     = debian-sys-maint
password = your-password-here
socket   = /var/run/mysqld/mysqld.sock
basedir  = /usr 

2. login to mysql:

mysql -u root -p

3. grant the rights to debian-sys-maint

mysql> GRANT ALL PRIVILEGES ON *.* TO ‘debian-sys-maint’@'localhost’ IDENTIFIED BY ‘your-password-here’ WITH GRANT OPTION;

Query OK, 0 rows affected (0.00 sec) 

Done!