About Ubuntu installed MySQL, removed again apt-get install error problem

The Apt-get install is installed online, but the problem arises:

Dpkg:error processing Mysql-server (--configure): Dependency problems-leaving unconfigured
Start:job failed to start
Invoke-rc.d:initscript MySQL, action "start" failed.
Dpkg:error processing mysql-server-5.5 (--configure):
Many related posts have been found online, most of them say:

View network Configuration
Auto Lo
Iface Lo inet Loopback

I did a bit of research on my configuration. The problem is that I deleted it manually. The solution is as follows:

sudo rm/var/lib/mysql/-R
sudo rm/etc/mysql/-R
sudo apt-get autoremove mysql*--purge
sudo apt-get remove AppArmor
sudo apt-get install mysql-server Mysql-common

Then reinstall, everything OK

(Why not install mysql-client 5.6, rely too much, too lazy to get)

About Ubuntu installed MySQL, removed again apt-get install error problem