To uninstall ubuntu-release-upgrader-core just follow these instructions.
sudo apt-get remove ubuntu-release-upgrader-core
This will remove just the ubuntu-release-upgrader-core package itself.
sudo apt-get remove --auto-remove ubuntu-release-upgrader-core
This will remove the ubuntu-release-upgrader-core package and any other dependant packages which are no longer needed.
If you also want to delete your local/config files for ubuntu-release-upgrader-core then this will work.
sudo apt-get purge ubuntu-release-upgrader-core
Or similarly, like this ubuntu-release-upgrader-core
sudo apt-get purge --auto-remove ubuntu-release-upgrader-core
|Maintainer||Ubuntu Developers <email@example.com>|
|Description||manage release upgrades|