MariaDB [(none)]> UPDATE mysql.user SET Password=PASSWORD('123') WHERE User='root';
Query OK, 1 row affected (0.00 sec)
Rows matched: 1  Changed: 1  Warnings: 0

MariaDB [(none)]> Ctrl-C -- exit!
Aborted
root@otrs:/home/justlooked/Загрузки# service mysql restart
eroot@otrs:/home/justlooked/Загрузки# exit
exit
justlooked@otrs:~/Загрузки$ mysql
ERROR 1698 (28000): Access denied for user 'justlooked'@'localhost'
justlooked@otrs:~/Загрузки$ mysql -u root
ERROR 1698 (28000): Access denied for user 'root'@'localhost'
justlooked@otrs:~/Загрузки$ mysql -u root -p
Enter password:
ERROR 1698 (28000): Access denied for user 'root'@'localhost'
justlooked@otrs:~/Загрузки$ mysql -u root -p 123
Enter password:
ERROR 1698 (28000): Access denied for user 'root'@'localhost'
justlooked@otrs:~/Загрузки$