@Deepin安裝MySQL（MariaDB）不提示設定密碼問題（密碼為空）

1、安裝Mysql
輸入命令：

sudo apt-get update

sudo apt-get install mysql-server mysql-client
發現沒有提示設定密碼，按照教程在/etc/mysql/下找到debian.conf檔案獲取使用者名稱和密碼 ，發現密碼為空，輸入不了，無法登陸。

sudo cat /etc/mysql/debian.cnf

mysql -uroot -p

Enter password:
2、修改密碼
準備修改密碼，按照以下文章嘗試；
如何修改mysql資料庫密碼/如何處理debian-sys-maint密碼被修改的情況.

sudo service mysql stop

sudo mysqld_safe --user=mysql --skip-grant-tables --skip-networking&
mysql
MariaDB [(none)]> use mysql;

MariaDB [mysql]> update user set password=password('123456') where user='root'

MariaDB [mysql]> flush privileges;
依然無法登入。

3、進行MariaDB的安全設定
mysql -V

mysql Ver 15.1 Distrib 10.1.37-MariaDB, for debian-linux-gnu (x86_64) using readline 5.2
通過版本檢視，發現MySQL更替為了MariaDB。MariaDB預設root密碼為空，所以進行設定：

sudo systemctl start mariadb

sudo /usr/bin/mysql_secure_installation
NOTE: RUNNING ALL PARTS OF THIS SCRIPT IS RECOMMENDED FOR ALL MariaDB

  SERVERS IN PRODUCTION USE!  PLEASE READ EACH STEP CAREFULLY!

In order to log into MariaDB to secure it, we'll need the current

password for the root user. If you've just installed MariaDB, and

you haven't set the root password yet, the password will be blank,

so you should just press enter here.

Enter current password for root (enter for none):

OK, successfully used password, moving on...

Setting the root password ensures that nobody can log into the MariaDB

root user without the proper authorisation.

Set root password? [Y/n] y

New password:

Re-enter new password:

Sorry, you can't use an empty password here.

New password:

Re-enter new password:

Password updated successfully!

Reloading privilege tables..

... Success!

By default, a MariaDB installation has an anonymous user, allowing anyone

to log into MariaDB 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? [Y/n] 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? [Y/n] y

... Success!

By default, MariaDB 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? [Y/n] 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? [Y/n] y

... Success!

Cleaning up...

All done! If you've completed all of the above steps, your MariaDB

installation should now be secure.

Thanks for using MariaDB!
原文章： mysql（mariadb）重灌.
然而還是沒什麼卵用。

4、解除安裝重灌
重複嘗試多次後，切換到root，解除安裝MySQL，然後重灌，竟然好了/(ㄒoㄒ)/~~

$ su root

apt-get remove --purge mysql-*

apt-get autoremove mysql-server

apt-get remove mysql-common

dpkg -l |grep ^rc|awk '{print $2}' |sudo xargs dpkg -P

apt-get install mysql-server mysql-client
重灌之後，密碼還是空，但是能登入。

pgrep mysqld
8957

mysql -uroot -p
Enter password:

elcome to the MariaDB monitor. Commands end with ; or \g.

Your MariaDB connection id is 2

Server version: 10.1.37-MariaDB-0+deb9u1 Debian 9.6

Copyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

5、（更新）最終解決辦法
最終查明原因是使用者外掛問題。按照第二步方法更改密碼的方式，增加外掛說明：

MariaDB [(none)]> UPDATE mysql.user SET authentication_string = PASSWORD('mypassword'), plugin = 'mysql_native_password' WHERE User = 'root' AND Host = 'localhost';

MariaDB [(none)]> FLUSH PRIVILEGES;

MariaDB [(none)]> exit
關閉，重啟服務：

$ service mysql stop

$ sudo service mysql start
原文連結：https://blog.csdn.net/weixin_43329319/article/details/90240762