Activated: Add a mechanism to perform release updates

to check for release

do-release-upgrade -c # If returns 0, it means an update is available. Requires Internet connection. Even if there is no Internet, it will return 1, so should be OK

To check if there are packages to update.

IFS=';' read updates security_updates << (/usr/lib/update-notifier/apt-check 2>&1)
echo $updates
echo $security_updates