今天把ubuntu16.04中的mysql卸载重装了，通过
sudo apt-get install mysql-client mysql-server命令安装mysql的时候报了如下错误
Job for mysql.service failed because the control process exited with error code. See "systemctl status mysql.service" and "journalctl -xe" for details.
invoke-rc.d: initscript mysql, action "start" failed.
● mysql.service - MySQL Community Server
Loaded: loaded (/lib/systemd/system/mysql.service; enabled; vendor preset: enabled)
Active: activating (auto-restart) (Result: exit-code) since Sat 2019-12-14 14:10:28 CST; 9ms ago
Process: 21157 ExecStartPre=/usr/share/mysql/mysql-systemd-start pre (code=exited, status=1/FAILURE)
dpkg: error processing package mysql-server-5.7 (--configure):
subprocess installed post-installation script returned error exit status 1
Setting up mysql-client (5.7.28-0ubuntu0.16.04.2) ...
dpkg: dependency problems prevent configuration of mysql-server:
mysql-server depends on mysql-server-5.7; however:
Package mysql-server-5.7 is not configured yet.
dpkg: error processing package mysql-server (--configure):
dependency problems - leaving unconfigured
Processing triggers for systemd (229-4ubuntu19) ...
No apport report written because the error message indicates its a followup error from a previous failure.
Processing triggers for ureadahead (0.100.0-19) ...
Processing triggers for libc-bin (2.23-0ubuntu9) ...
Errors were encountered while processing:
mysql-server-5.7
mysql-server
E: Sub-process /usr/bin/dpkg returned an error code (1)
其中有如下一条报错信息：dpkg:依赖关系问题阻止了mysql服务器的配置
dpkg: dependency problems prevent configuration of mysql-server
由此可以看出，当时卸载mysql的时候没有卸载干净。可以依次执行如下命令进行卸载
sudo apt-get remove mysql-*
dpkg -l |grep ^rc|awk '{print $2}' |sudo xargs dpkg -P
sudo apt-get autoremove mysql* --purge
sudo apt-get remove apparmor
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