Ubuntu 18 mysql数据库登陆报错“Access denied for user”

mysql数据登陆出现如下错误:
#mysql -uroot
error: 'Access denied for user 'root'@'localhost' (using password: NO)'

解决方法:
问题原因:还未找到(待补充)。
一、sudo vim /etc/mysql/debian.cnf
记录文件中user和密码。
[client]
host = localhost
user = debian-sys-maint
password = 0NynruOCi9W3kdnQ

socket = /var/run/mysqld/mysqld.sock
[mysql_upgrade]
host = localhost
user = debian-sys-maint
password = 0NynruOCi9W3kdnQ
socket = /var/run/mysqld/mysqld.sock

用debian-sys-maint用户登陆进数据库:
#mysql -u debian-sys-maint -p0NynruOCi9W3kdnQ

二、重置root密码为123456:
mysql>SET PASSWORD FOR 'root'@'localhost' = PASSWORD('123456');
mysql>flush privileges
mysql>quit

三、使用root新密码登陆
mysql -uroot -p123456

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转载自blog.51cto.com/4150953/2380693