Sometimes the Kubuntu developers release feature and security updates for applications and packages within the Kubuntu system.
When these updates are available, Kubuntu will inform you with a red warning icon in the system tray. To update your system, click the red button, enter your password and click Fetch List of Updates.
The Adept Updater program will list the available updates: to download and install these updates click Apply Updates. Kubuntu will then download and install the available updates from the Internet.
When Adept Updater has finished updating your system, close the pop-up window by clicking the Quit button.
After installing some important updates, it may be necessary to restart your computer. If so, Kubuntu will inform you with a pop up and an icon in your system tray.