Requires plasma-discover to be installed. Uses apt commands to update (KDE Neon / Kubuntu).
Clicking the "Update" button will instead open Konsole with the output of apt list --upgradeable, prompting you to run sudo apt upgrade.
1. After installing, right click the "triangle" in the system tray, then click "System Tray Settings".
2. Uncheck "Updates"
3. Check "Updates (Terminal)"
The widget also links to the Ubuntu (https://usn.ubuntu.com/usn/xenial/) and KDE Security Notices (https://www.kde.org/info/security/) if you're interested in seeing what triggered a security update.