我有 Ubuntu 15.10 (wily) 并且正在尝试将 MySQL 更新到最新版本。
当我运行时aptitude safe-upgrade，它会失败，如下所示：
Errors were encountered while processing:
mysql-server-5.6
mysql-server
E: Sub-process /usr/bin/dpkg returned an error code (1)
Failed to perform requested operation on package. Trying to recover:
Setting up mysql-server-5.6 (5.6.28-0ubuntu0.15.10.1) ...
* Stopping MySQL database server mysqld [ OK ]
* Starting MySQL database server mysqld [ OK ]
invoke-rc.d: initscript mysql, action "start" failed.
dpkg: error processing package mysql-server-5.6 (--configure):
subprocess installed post-installation script returned error exit status 1
dpkg: dependency problems prevent configuration of mysql-server:
mysql-server depends on mysql-server-5.6; however:
Package mysql-server-5.6 is not configured yet.
dpkg: error processing package mysql-server (--configure):
dependency problems - leaving unconfigured
Errors were encountered while processing:
mysql-server-5.6
mysql-server
dpkg -l显示：
rc mysql-server-5.5 5.5.46-0ubuntu0.14.04.2 amd64 MySQL database server binaries and system database setup
iF mysql-server-5.6 5.6.28-0ubuntu0.15.10.1 amd64 MySQL database server binaries and system database setup
这是 MySQL 错误日志：
160318 00:22:20 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
2016-03-18 00:22:20 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2016-03-18 00:22:20 0 [Note] /usr/sbin/mysqld (mysqld 5.6.28-0ubuntu0.15.10.1) starting as process 4383 ...
2016-03-18 00:22:20 4383 [Warning] Buffered warning: Changed limits: max_open_files: 1024 (requested 5000)
2016-03-18 00:22:20 4383 [Warning] Buffered warning: Changed limits: table_open_cache: 431 (requested 2000)
2016-03-18 00:22:20 4383 [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.
2016-03-18 00:22:20 4383 [Note] Plugin 'FEDERATED' is disabled.
2016-03-18 00:22:20 4383 [ERROR] Function 'innodb' already exists
2016-03-18 00:22:20 4383 [Warning] Couldn't load plugin named 'innodb' with soname 'ha_innodb.so'.
2016-03-18 00:22:20 4383 [ERROR] Function 'federated' already exists
2016-03-18 00:22:20 4383 [Warning] Couldn't load plugin named 'federated' with soname 'ha_federated.so'.
2016-03-18 00:22:20 4383 [ERROR] Function 'blackhole' already exists
2016-03-18 00:22:20 4383 [Warning] Couldn't load plugin named 'blackhole' with soname 'ha_blackhole.so'.
2016-03-18 00:22:20 4383 [ERROR] Function 'archive' already exists
2016-03-18 00:22:20 4383 [Warning] Couldn't load plugin named 'archive' with soname 'ha_archive.so'.
2016-03-18 00:22:20 4383 [Note] InnoDB: Using atomics to ref count buffer pool pages
2016-03-18 00:22:20 4383 [Note] InnoDB: The InnoDB memory heap is disabled
2016-03-18 00:22:20 4383 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2016-03-18 00:22:20 4383 [Note] InnoDB: Memory barrier is not used
2016-03-18 00:22:20 4383 [Note] InnoDB: Compressed tables use zlib 1.2.8
2016-03-18 00:22:20 4383 [Note] InnoDB: Using Linux native AIO
2016-03-18 00:22:20 4383 [Note] InnoDB: Not using CPU crc32 instructions
2016-03-18 00:22:20 4383 [Note] InnoDB: Initializing buffer pool, size = 128.0M
2016-03-18 00:22:20 4383 [Note] InnoDB: Completed initialization of buffer pool
2016-03-18 00:22:20 4383 [Note] InnoDB: Highest supported file format is Barracuda.
2016-03-18 00:22:20 4383 [Note] InnoDB: 128 rollback segment(s) are active.
2016-03-18 00:22:20 4383 [Note] InnoDB: Waiting for purge to start
2016-03-18 00:22:20 4383 [Note] InnoDB: 5.6.28 started; log sequence number 520254865948
2016-03-18 00:22:20 4383 [Note] Server hostname (bind-address): '127.0.0.1'; port: 3306
2016-03-18 00:22:20 4383 [Note] - '127.0.0.1' resolves to '127.0.0.1';
2016-03-18 00:22:20 4383 [Note] Server socket created on IP: '127.0.0.1'.
2016-03-18 00:22:20 4383 [Note] Event Scheduler: Loaded 0 events
2016-03-18 00:22:20 4383 [Note] /usr/sbin/mysqld: ready for connections.
Version: '5.6.28-0ubuntu0.15.10.1' socket: '/var/run/mysqld/mysqld.sock' port: 3306 (Ubuntu)
Launchpad bug 1468185 似乎意味着 InnoDB 错误可以安全忽略： https://bugs.launchpad.net/ubuntu/+source/mysql-5.6/+bug/1468185
明天会尝试修复这个问题。请注意，这不是一个严重的错误，只是输出垃圾信息，所以解决方法基本上就是忽略它 :)
更新：问题来自invoke-rc.d：
# /etc/init.d/mysql stop
* Stopping MySQL database server mysqld [ OK ]
# /etc/init.d/mysql start
* Starting MySQL database server mysqld [ OK ]
# invoke-rc.d mysql stop
* Stopping MySQL database server mysqld [ OK ]
# invoke-rc.d mysql start
* Starting MySQL database server mysqld [ OK ]
invoke-rc.d: initscript mysql, action "start" failed.