To uninstall upgrade-system just follow these instructions.
/ubuntu/vivid/universe///install/index.html command for upgrading and sanitizing a Debian system Ubuntu 15.04 universe/admin 22.214.171.124
sudo apt-get remove upgrade-system
Which will remove just the upgrade-system package itself.
sudo apt-get remove --auto-remove upgrade-system
This will remove the upgrade-system package and any other dependant packages which are no longer needed.
If you also want to delete your local/config files for upgrade-system then this will work.
sudo apt-get purge upgrade-system
Or similarly, like this upgrade-system
sudo apt-get purge --auto-remove upgrade-system
|Description||command for upgrading and sanitizing a Debian system|