sudo DEBIAN_PRIORITY=critical apt-get install -y -q mysql-server php5-mysql

$ mysql -u root

ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)

$ mysql -u "root" -p ""
$ mysql --user="root" --password=""

$ mysqladmin -u root password ""

mysqladmin: connect to server at 'localhost' failed
error: 'Access denied for user 'root'@'localhost' (using password: NO)'
but unfortunately without any success.