Revert "Use ubuntu 18.04 for pylint"
Revert "Use ubuntu 18.04 for pylint"

This reverts commit 83322de0d53211c748be94ee15b56fd999331526.

JNeiger/robocup-software,JNeiger/robocup-software,RoboJackets/robocup-software,RoboJackets/robocup-software,RoboJackets/robocup-software,RoboJackets/robocup-software,JNeiger/robocup-software,JNeiger/robocup-software,JNeiger/robocup-software