您可以使用该命令:

UPDATE mysql.user SET Password=PASSWORD('newpwd') WHERE User='root';

之后请冲洗:

FLUSH PRIVILEGES;

对于mysql 5.6，这个命令有效，你可以通过向导设置密码:

sudo dpkg-reconfigure mysql-server-5.6

这就像我为Ubuntu 16.04做的一样。 完全归功于下面的链接，因为我从那里得到了它。 [https://coderwall.com/p/j9btlg/reset-the-mysql-5-7-root-password-in-ubuntu-16-04-lts] [1]

停止MySQL

sudo service mysql stop

制作MySQL服务目录。 Sudo mkdir /var/run/mysqld

赋予MySQL用户写入服务目录的权限。

sudo chown mysql: /var/run/mysqld

手动启动MySQL，不需要权限检查或联网。

sudo mysqld_safe --skip-grant-tables --skip-networking &

无需密码即可登录。

mysql -uroot mysql

更新root用户密码。 确保下面的查询至少更新了根帐户。 如果您愿意，进行一些选择并检查现有的值

UPDATE mysql.user SET 
authentication_string=PASSWORD('YOURNEWPASSWORD'), 
plugin='mysql_native_password' WHERE User='root';
EXIT;

关闭MySQL。

sudo mysqladmin -S /var/run/mysqld/mysqld.sock shutdown

正常启动MySQL服务。

sudo service mysql start

我遇到ubuntu 18.04和mysql 5.7的问题，这是解决方案

执行命令前请尝试重新启动mysql-server

sudo service mysql restart

Mysql-server >= 5.7

sudo mysql -uroot -p
USE mysql;
UPDATE user SET authentication_string=PASSWORD('YOUR_PASSWORD') WHERE User='root';
UPDATE user SET plugin="mysql_native_password";
FLUSH PRIVILEGES;
quit;

Mysql-server < 5.7

sudo mysql -uroot -p
USE mysql;
UPDATE user SET password=PASSWORD('YOUR_PASSWORD') WHERE User='root';
UPDATE user SET plugin="mysql_native_password";
FLUSH PRIVILEGES;
quit;

我还没有看到MySQL 8.0指南中推荐的官方步骤，这是唯一适合我的步骤。下面是这些步骤的总结。

Stop the MySQL server if it is running. Look in /var/lib/mysql/, /var/run/mysqld/, or /usr/local/mysql/data/ to find the pid file with the server's process ID. Generally the file begins with either mysqld or your system's host name and ends with .pid. Replace mysql-data-directory and host_name that you just found, in the following command: $ sudo kill `sudo cat /mysql-data-directory/host_name.pid` This command will create a text file in /tmp/mysql-init with the SQL statement and makes the mysql user the owner. Replace in the command MyNewPass with your own password. $ echo "ALTER USER 'root'@'localhost' IDENTIFIED BY 'MyNewPass';" > /tmp/mysql-init && sudo chown mysql /tmp/mysql-init Start the MySQL server by running the following command on the command line. After this the password is updated and you can close the server again with CTRL+C. $ sudo mysqld --user=mysql --init-file=/tmp/mysql-init & Remove the temporary file with your password: $ sudo rm /tmp/mysql-init

对于Ubuntu 18.04和mysql版本14.14,Distrib 5.7.22，请按照以下步骤重置mysql密码。

步骤1

sudo systemctl stop mysql

步骤2

sudo systemctl edit mysql

这个命令将在nano编辑器中打开一个新文件，您将使用该文件编辑MySQL的服务覆盖。这些更改MySQL的默认服务参数。该文件将为空，因此添加以下内容:

[Service]
ExecStart=
ExecStart=/usr/sbin/mysqld --daemonize --pid-file=/run/mysqld/mysqld.pid --skip-grant-tables --skip-networking

步骤3

sudo systemctl daemon-reload
sudo systemctl start mysql

步骤4

sudo mysql -u root

步骤5

FLUSH PRIVILEGES;

步骤6

UPDATE mysql.user SET authentication_string = PASSWORD('new_password') WHEREuser = 'root';

步骤7

UPDATE mysql.user SET plugin ='mysql_native_password' WHERE user = 'root';

步骤8

sudo systemctl revert mysql

最后

sudo systemctl restart mysql

现在享受