After Ubuntu18.04 installed MySQL5.7, root account password problem

Do not know which version to start with on Ubuntu apt After installing MySQL, you will not be prompted to set the password.

Installation MySQL5.7

sudo apt install mysql-server -y

Then find the MySQL configuration file directory 

sudo cat /etc/mysql/debian.cnf

You will see the default MySQL account debian-sys-maint and default random password

mysql -u debian-sys-maint -p

You will be prompted to enter a password! Enter the password to see it go into the inside of MySQL cli

Then modify the MySQL password authentication plug-in

MySQL5.6 With the addition of a password authentication plug-in, MySQL5.7 default root password authentication plug-in installed on Ubuntu is auth_socket, we need to plug changed mysql_native_password

update user set plugin = 'mysql_native_password' where user ='root';

 

Then change the root account password

update user set authentication_string=password('你的密码') where user='root';

Then refresh MySQL 

flush privileges;

Then quit MySQL, log back in using the modified password.