ubunut 装的时候遇到了个头疼的问题，导致删也删不掉，重装也报错，更坑的的它出错导致系统更新也完成不了。。。
Unpacking mysql-server (from .../mysql-server_5.5.34-0ubuntu0.12.04.1_all.deb) ...
Processing triggers for man-db ...
Setting up libmysqlclient18 (5.5.34-0ubuntu0.12.04.1) ...
Setting up libdbd-mysql-perl (4.020-1build2) ...
Setting up mysql-client-core-5.5 (5.5.34-0ubuntu0.12.04.1) ...
Setting up mysql-client-5.5 (5.5.34-0ubuntu0.12.04.1) ...
Setting up mysql-server-core-5.5 (5.5.34-0ubuntu0.12.04.1) ...
Setting up mysql-server-5.5 (5.5.34-0ubuntu0.12.04.1) ...
131130 18:01:34 [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.
start: Job failed to start
invoke-rc.d: initscript mysql, action "start" failed.
dpkg: error processing mysql-server-5.5 (--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-5.5; however:
Package mysql-server-5.5 is not configured yet.
dpkg: error processing mysql-server (--configure):
dependency problems - leaving unconfigured
Processing triggers for libc-bin ...
No apport report written because the error message indicates its a followup error from a previous failure.
ldconfig deferred processing now taking place
Errors were encountered while processing:
mysql-server-5.5
mysql-server
E: Sub-process /usr/bin/dpkg returned an error code (1)
最终在stackoverflow上找到了可行的方案：
sudo apt-get --reinstall install mysql-server-5.5