下面的步骤对我很有效。我使用MySQL 8。*在Ubuntu上

停止MySQL服务，检查状态确认服务已停止

Sudo systemctl停止mysql Sudo systemctl status mysql

编辑systemd配置文件，这样您就可以在没有权限检查的情况下访问MySQL Sudo systemctl编辑mysql 复制并粘贴以下3行

(服务) ExecStart = ExecStart=/usr/sbin/mysqld——skip-grant-tables——skip-networking

粘贴行后按CTRL+0保存，然后按CTRL+X退出

重新加载mysql服务并启动它(使用——skip-grant-table启动服务)

Sudo systemctl daemon-reload Sudo systemctl启动mysql

5.现在无需密码即可连接MySQL服务器

sudo mysql -u root

6.通过运行加载授权表

mysql> FLUSH PRIVILEGES;

重置root密码

ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY 'YourPasswordHere';

关闭mysql连接

mysql >退出

恢复对mysql systemd文件所做的修改

Sudo systemctl恢复mysql

重新加载mysql守护进程以进行更改。

Sudo systemctl daemon-reload

最后重新启动MySQL服务

Sudo systemctl restart mysql

现在用第7步设置的新密码连接mysql

你可以访问这个链接重置mysql 8的根密码了解更多细节。

Instead of resetting the password there is a work around on the local machine if you have setup phpmyadmin to connect without giving the password or username. Check this out by starting mysql, apache etc. I have xampp installed in my local machine. So starting the xampp will start all the necessary services. Now going to http://localhost/phpmyadmin shows me all the databases. This confirms that you have saved the username and passsword in the config file of phpmyadmin which can be found in the phpmyadmin install location. If you have xampp installed the phpmyadmin folder can be found in the root folder of xampp installation. Search for the word password in the config.inc.php file. There you will find the password and username.

如果你想修改MySQL root密码，在终端输入:

Sudo dpkg-reconfigure mysql-server-5.5

MySQL守护进程将被停止，并提示您输入新密码。

你可以尝试以下步骤来重置mysql的root密码:

首先停止Mysql服务

sudo /etc/init.d/mysql stop 

以root用户登录，不需要密码 Sudo mysqld_safe—skip-grant-tables &

登录mysql终端后，你需要执行更多的命令:

use mysql;




UPDATE mysql.user SET authentication_string=PASSWORD('solutionclub3@*^G'), plugin='mysql_native_password' WHERE User='root';


flush privileges;


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

重启mysql服务器后 如果你仍然面临错误，你必须访问: 重置MySQL的root密码

I had to go this route on Ubuntu 16.04.1 LTS. It is somewhat of a mix of some of the other answers above - but none of them helped. I spent an hour or more trying all other suggestions from MySql website to everything on SO, I finally got it working with: Note: while it showed Enter password for user root, I didnt have the original password so I just entered the same password to be used as the new password. Note: there was no /var/log/mysqld.log only /var/log/mysql/error.log Also note this did not work for me: sudo dpkg-reconfigure mysql-server-5.7 Nor did: sudo dpkg-reconfigure --force mysql-server-5.5 Make MySQL service directory. sudo mkdir /var/run/mysqld Give MySQL user permission to write to the service directory. sudo chown mysql: /var/run/mysqld Then:

kill the current mysqld pid run mysqld with sudo /usr/sbin/mysqld & run /usr/bin/mysql_secure_installation Output from mysql_secure_installation root@myServer:~# /usr/bin/mysql_secure_installation Securing the MySQL server deployment. Enter password for user root: VALIDATE PASSWORD PLUGIN can be used to test passwords and improve security. It checks the strength of password and allows the users to set only those passwords which are secure enough. Would you like to setup VALIDATE PASSWORD plugin? Press y|Y for Yes, any other key for No: no Using existing password for root. Change the password for root ? ((Press y|Y for Yes, any other key for No) : y New password: Re-enter new password: By default, a MySQL installation has an anonymous user, allowing anyone to log into MySQL without having to have a user account created for them. This is intended only for testing, and to make the installation go a bit smoother. You should remove them before moving into a production environment. Remove anonymous users? (Press y|Y for Yes, any other key for No) : y Success. Normally, root should only be allowed to connect from 'localhost'. This ensures that someone cannot guess at the root password from the network. Disallow root login remotely? (Press y|Y for Yes, any other key for No) : y Success. By default, MySQL comes with a database named 'test' that anyone can access. This is also intended only for testing, and should be removed before moving into a production environment. Remove test database and access to it? (Press y|Y for Yes, any other key for No) : y Dropping test database... Success. Removing privileges on test database... Success. Reloading the privilege tables will ensure that all changes made so far will take effect immediately. Reload privilege tables now? (Press y|Y for Yes, any other key for No) : y Success. All done!

唯一对我有效的方法是这里描述的(我运行的是ubuntu 14.04)。为了清晰起见，以下是我遵循的步骤:

sudo vim /etc/mysql/my.cnf Add the following lines at the end: [mysqld] skip-grant-tables sudo service mysql restart mysql -u root use mysql select * from mysql.user where user = 'root'; - Look at the top to determine whether the password column is called password or authentication_string UPDATE mysql.user set *password_field from above* = PASSWORD('your_new_password') where user = 'root' and host = 'localhost'; - Use the proper password column from above FLUSH PRIVILEGES; exit sudo vim /etc/mysql/my.cnf Remove the lines added in step 2 if you want to keep your security standards. sudo service mysql restart

参考:https://dev.mysql.com/doc/refman/5.7/en/resetting-permissions.html