MySQL does not boot after Libmysqlclient-dev installation in Debian

System environment: DEBIAN,AMH Panel
Because the MySQL client is developed with C + +, the Libmysqlclient-dev is installed, and then AMH MySQL does not start, and the error message is:
The server quit without updating PID file (/var/run/mysqld/mysqld.pid)

After the search was fruitless, I tried to think of all the causes of the problem, luckily I had a VPS with the AMH panel installed, so I started to compare the environment and configuration of 2 machines with the contrast method.
First look at the configuration file used by MySQL server.

root@debian:/home/nine#/usr/local/mysql/bin/mysql--verbose--help | Grep-a 1 ' Default options '
Back: Default options are read from the following files in the given order:
/ETC/MY.CNF/ETC/MYSQL/MY.CNF/USR/LOCAL/MYSQL/ETC/MY.CNF ~/.my.cnf

Originally, Libmysqlclient-dev installed after the installation of 3 profiles, which point to different directories, resulting in configuration confusion, RM command Delete:

root@debian:/home/nine# rm-f/etc/mysql/my.cnf
root@debian:/home/nine# rm-f/usr/local/mysql/etc/my.cnf
root@debian:/home/nine# rm-f ~/.my.cnf
At this point, the MySQL server has been able to start normally.