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Got a problem with a mysql server installation on Debian. (Not my server so I have no idea what caused this...)

Installing new applications that add a database fail with error:

ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)

I can log in with the user, I've flushed permissions...

Then I can across this question:

But when I try to stop mysql, it fails with

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

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up vote 4 down vote accepted

Debian use debian-sys-maint account for management (start/stop etc.). Credentials are stored in /etc/mysql/debian.cnf - check if all are valid.

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There are many ways of restoring the debian-sys-maint user. Most easy to do is to reconfigure package mysql-server-5.5. That if you know the password for the root user of MySQL, you can try to restore the user and its password in /etc/mysql/debian.cnf.

sudo dpkg-reconfigure mysql-server-5.5

To restore MySQL:s root password (or any MySQL-users password) you can use the debian-sys-maint account. You need to run mysql to get the password for the debian-sys-maint account.

sudo mysql --defaults-file=/etc/mysql/debian.cnf
mysql> UPDATE mysql.user SET Password=PASSWORD('secret') WHERE User='root';
mysql> QUIT;

So, never remove the user debian-sys-maint, as it is used in Debian to administrate MySQL (shut it down, roll logs, upgrade packages, check existans of root user in MySQL, set new root user password etc).

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In my case i just sudo killall mysqld then run sudo dpkg-reconfigure mysql-server-5.5, Now everything is ok. – shgnInc Mar 6 '15 at 19:26

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