ubuntu mysql root password忘记解决办法

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mysql -u debian-sys-maint -p

密码在/etc/mysql/debian.cnf里；

执行如下命令；

mysql> use mysql;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)

mysql> update mysql.user set authentication_string=password('root') where user='root' and Host ='localhost';
Query OK, 0 rows affected, 1 warning (0.00 sec)
Rows matched: 1  Changed: 0  Warnings: 1

mysql> update user set plugin="mysql_native_password";
Query OK, 1 row affected (0.00 sec)
Rows matched: 4  Changed: 1  Warnings: 0

mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)

mysql> exit
Bye
gb@gb-VirtualBox:/etc/mysql$ mysql -u root -p
Enter password:
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 13
Server version: 5.7.30-0ubuntu0.18.04.1 (Ubuntu)

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