今天，在Ubuntu服务器上停止运行MySQL。 当我尝试登录时，我收到此错误：
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2)
检查错误：
mysqld --verbose
160408 3:21:24 [Warning] Using unique option prefix key_buffer instead of key_buffer_size is deprecated and will be removed in a future release. Please use the full name instead.
160408 3:21:24 [ERROR] Fatal error: Can't change to run as user 'mysql' ; Please check that the user exists!
160408 3:21:24 [ERROR] Aborting
160408 3:21:24 [Note] mysqld: Shutdown complete
我尝试了sudo service mysql start：
start: Job failed to start
我也尝试过：
ps ax | grep mysql
4127 pts/0 S+ 0:00 grep --color=auto mysql
和
sudo chown mysql:root -R /var/lib/mysql
chown: invalid user: `mysql:root'
我还检查了服务器上是否没有空间：
Filesystem Size Used Avail Use% Mounted on
/dev/vda1 79G 27G 49G 35% /
udev 3.9G 4.0K 3.9G 1% /dev
tmpfs 1.6G 204K 1.6G 1% /run
none 5.0M 0 5.0M 0% /run/lock
none 3.9G 0 3.9G 0% /run/shm
none 100M 0 100M 0% /run/user
但是有足够的空间。
如果我尝试检查套接字：cd /var/run/mysqld/，那么：
-bash: cd: /var/run/mysqld/: No such file or directory
如何解决此问题？或者至少 - 如何从数据库中保存数据？
非常感谢！