mysql报错：ERROR 1045 (28000): Access denied for user ‘root‘@‘localhost‘

在Ubuntu安装好MySQL后报错

安装命令（Ubuntu 20.04）：

sudo apt install mysql-server
sudo systemctl start mysql.service
sudo mysql_secure_installation

然后查看版本会报错

➜  ~ mysql -v
ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)
➜  ~ mysql --version
mysql  Ver 8.0.29-0ubuntu0.20.04.2 for Linux on x86_64 ((Ubuntu))

原因为用户设置有问题

通过sudo mysql进入

sudo mysql

然后修改密码

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

重新登录可以了

mysql -u root -p