mysql：無法為MySQL“ root”用戶設置密碼

Question

我嘗試通過網絡上的許多指南在Ubuntu 14.4 Server上安裝MySQL。 但是在MySQL安裝過程中通過各種方式都遇到了這個問題：

Setting up libdbd-mysql-perl (4.025-1) ...
Setting up mysql-client-5.6 (5.6.31-0ubuntu0.14.04.2) ...
Setting up mysql-server-5.6 (5.6.31-0ubuntu0.14.04.2) ...
2016-08-28 10:45:19 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2016-08-28 10:45:19 0 [Note] /usr/sbin/mysqld (mysqld 5.6.31-0ubuntu0.14.04.2-log) starting as process 4394 ...
2016-08-28 10:45:19 4394 [Warning] Using unique option prefix myisam_recover instead of myisam-recover-options is deprecated and will be removed in a future release. Please use the full name instead.
2016-08-28 10:45:19 4394 [Note] Plugin 'FEDERATED' is disabled.
2016-08-28 10:45:19 4394 [Note] InnoDB: Using atomics to ref count buffer pool pages
2016-08-28 10:45:19 4394 [Note] InnoDB: The InnoDB memory heap is disabled
2016-08-28 10:45:19 4394 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2016-08-28 10:45:19 4394 [Note] InnoDB: Memory barrier is not used
2016-08-28 10:45:19 4394 [Note] InnoDB: Compressed tables use zlib 1.2.8
2016-08-28 10:45:19 4394 [Note] InnoDB: Using Linux native AIO
2016-08-28 10:45:19 4394 [Note] InnoDB: Using CPU crc32 instructions
2016-08-28 10:45:19 4394 [Note] InnoDB: Initializing buffer pool, size = 256.0M
2016-08-28 10:45:19 4394 [Note] InnoDB: Completed initialization of buffer pool
2016-08-28 10:45:19 4394 [Note] InnoDB: Highest supported file format is Barracuda.
2016-08-28 10:45:19 4394 [Note] InnoDB: 128 rollback segment(s) are active.
2016-08-28 10:45:19 4394 [Note] InnoDB: Waiting for purge to start
2016-08-28 10:45:19 4394 [Note] InnoDB: 5.6.31 started; log sequence number 2535999
2016-08-28 10:45:19 4394 [ERROR] /usr/sbin/mysqld: unknown variable 'log_slow_verbosity=query_plan'
2016-08-28 10:45:19 4394 [ERROR] Aborting
2016-08-28 10:45:19 4394 [Note] Binlog end
2016-08-28 10:45:19 4394 [Note] InnoDB: FTS optimize thread exiting.
2016-08-28 10:45:19 4394 [Note] InnoDB: Starting shutdown...
2016-08-28 10:45:21 4394 [Note] InnoDB: Shutdown completed; log sequence number 2536009
2016-08-28 10:45:21 4394 [Note] /usr/sbin/mysqld: Shutdown complete
Package configuration

然后顯示此錯誤：

設置MySQL管理用戶的密碼時發生錯誤。 這可能是由於該帳戶已經有密碼，或者是由於與MySQL服務器的通訊問題而發生的。

安裝軟件包后，您應該檢查帳戶的密碼。 請閱讀/usr/share/doc/mysql-server-5.6/README.Debian文件以獲取更多信息。

Answer 1

嘗試了很多東西。 檢查了錯誤日志vim /var/log/mysql/error.log，並發現了/ tmp文件夾權限的問題。 將權限更改為777，已卸載然后重新安裝。 奇跡般有效

Answer 2

也許，由於進行了后續教程，您弄亂了配置文件。

我建議您完成卸載程序包

apt-get remove --purge mysql-server
apt-get remove --purge mysql-common

然后確保/etc/mysql/my.cnf不存在。 然后重新安裝

apt-get install mysql-server