Kill Mysql service running on any port using terminal. Port number like 3306 or any.
sudo pkill mysql should serve your purpose.
If for some reason mysqld survives this, sudo pkill mysqld as well.
More information from SuperUser: https://superuser.com/questions/983969/how-to-kill-mysql-with-moving-pid
Simplifying your answer.
1) Go to Launchpad Type Terminal then Run this.
2) Run following commands
Check if Mysql service is running
For all listening ports
Apply port filter
Kill Mysql Service
< Enter password >
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