I removed mysql from Ubuntu server completely as below
sudo apt-get remove --purge mysql-server mysql-client mysql-common
sudo apt-get autoremove
sudo apt-get autoclean
sudo deluser mysql
sudo rm -rf /var/lib/mysql
sudo apt-get purge mysql-server-core-5.5
sudo apt-get purge mysql-client-core-5.5
When I run dpkg-query -l
there is no mysql package listed. However, when I do dpkg-query --show mysql-server
it prints out mysql-server
It must return "There is no package mysql-server installed" but I'm not sure why it shows mysql-server is installed.