我在使用 MariaDB 时遇到了问题，尽管它一开始工作正常。当我无法再启动 MySQL 守护进程时，我只重新启动了服务器。它似乎仍在使用我的旧 USB 记忆棒的文件路径 (/media/brood)，而我已经切换到新的 HDD (/media/seagate)。这是我在 /var/log/mysql/error.log 中遇到的错误：
160728 9:32:32 [ERROR] mysqld: Can't lock aria control file '/media/brood/mysql/aria_log_control' for exclusive use, error: 11. Will retry for 30 seconds
160728 9:33:03 [ERROR] mysqld: Got error 'Could not get an exclusive lock; file is probably in use by another process' when trying to use aria control file '/media/brood/mysql/aria_log_control'
160728 9:33:03 [ERROR] Plugin 'Aria' init function returned error.
160728 9:33:03 [ERROR] Plugin 'Aria' registration as a STORAGE ENGINE failed.
160728 9:33:03 [Note] InnoDB: Using mutexes to ref count buffer pool pages
160728 9:33:03 [Note] InnoDB: The InnoDB memory heap is disabled
160728 9:33:03 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
160728 9:33:03 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
160728 9:33:03 [Note] InnoDB: Compressed tables use zlib 1.2.8
160728 9:33:03 [Note] InnoDB: Using Linux native AIO
160728 9:33:03 [Note] InnoDB: Not using CPU crc32 instructions
160728 9:33:03 [Note] InnoDB: Initializing buffer pool, size = 128.0M
160728 9:33:03 [Note] InnoDB: Completed initialization of buffer pool
160728 9:33:03 [ERROR] InnoDB: Unable to lock ./ib_logfile0, error: 11
160728 9:33:03 [Note] InnoDB: Check that you do not already have another mysqld process using the same InnoDB data or log files.
160728 9:33:03 [ERROR] InnoDB: Unable to open './ib_logfile0'
160728 9:33:03 [ERROR] Plugin 'InnoDB' init function returned error.
160728 9:33:03 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed.
160728 9:33:03 [Note] Plugin 'FEEDBACK' is disabled.
mysqld: Too many arguments (first extra is 'stop').
160728 9:33:03 [ERROR] Aborting
160728 9:33:03 [Note] mysqld: Shutdown complete
也可能是权限问题，或者文件仍然被锁定（我不知道这是怎么回事），因为树莓派上次重启是因为有人不小心拔掉了树莓派的电源插头。
为什么日志包含旧 mysql 数据文件夹的路径对我来说仍然是个谜。 （这甚至不是之前的U盘，为了让故事更完整，它实际上是我之前用过的U盘！）但是，问题解决了！答案实际上比我想象的要简单得多，事实证明，当我哥哥注意到它卸载了 mariadb-server-10.0 时，他卸载了一些东西（他说是一个用于玩旧游戏的模拟器）（奇怪！）。所以我做了一个简单的sudo apt-get install mariadb-server-10.0，你猜怎么着！它解决了我的问题！ ：D