failed to start mysql.service unit mysql.service not found. ubuntu 18.04 code example

Example: failed to restart mysql.service: unit mysql.service not found.

# Try Uninstalling and Installing again

# Uninstall: 
sudo apt-get purge mysql-server
sudo apt-get autoremove
sudo apt-get autoclean

# Install:
sudo apt-get update
sudo apt-get install mysql-server