Восстановление пользователя debian-sys-maint

/etc/mysql/debian.cnf

use mysql;
INSERT INTO `user` (
  `Host`,
	`User`,
	`Password`,
	`Select_priv`,
	`Insert_priv`,
	`Update_priv`,
	`Delete_priv`,
	`Create_priv`,
	`Drop_priv`,
	`Reload_priv`,
	`Shutdown_priv`,
	`Process_priv`,
	`File_priv`,
	`Grant_priv`,
	`References_priv`,
	`Index_priv`,
	`Alter_priv`,
	`Show_db_priv`,
	`Super_priv`,
	`Create_tmp_table_priv`,
	`Lock_tables_priv`,
	`Execute_priv`,
	`Repl_slave_priv`,
	`Repl_client_priv`,
	`Create_view_priv`,
	`Show_view_priv`,
	`Create_routine_priv`,
	`Alter_routine_priv`,
	`Create_user_priv`,
	`ssl_type`,
	`ssl_cipher`,
	`x509_issuer`,
	`x509_subject`,
	`max_questions`,
	`max_updates`,
	`max_connections`,
	`max_user_connections`,
  `authentication_string` -- MariaDB
)
VALUES (
	'localhost',
	'debian-sys-maint',
	password('PASSWORD-HERE'),
	'Y',
	'Y',
	'Y',
	'Y',
	'Y',
	'Y',
	'Y',
	'Y',
	'Y',
	'Y',
	'Y',
	'Y',
	'Y',
	'Y',
	'Y',
	'Y',
	'Y',
	'Y',
	'Y',
	'Y',
	'Y',
	'N',
	'N',
	'N',
	'N',
	'N',
	'',
	'',
	'',
	'',
	0,
	0,
	0,
	0,
  ''
);
UPDATE `user` SET `password`=PASSWORD('kwxnvkYtSggKS4ds') WHERE `user`='debian-sys-maint';
FLUSH PRIVILEGES;

mysql -uroot -p mysql < restore-debian.sql