You should update your software as soon as you log in to Ubuntu for the first time to benefit from any available security and bug fixes. In that example, use the Update Manager (System->Administration->Update Manager), which is really a GUI wrapper for the command apt-get. In the background, Ubuntu automatically polls the software repositories configured as standard to determine whether any updates are available. When it detects that new versions of installed software are available, a pop-up message appears in the upper-right corner of your screen. By clicking the Updates icon in the panel, you automatically open Update Manager, but not before you are prompted for your password (because you are about to make a systemwide change).
Another way of updating your system, and one that can be quicker than Update Manager, is to use the command line. If you go to the Applications ->Accessories->Terminal option, a blank screen displays. This is the command line (commonly referred to as the terminal) and is one of the most powerful features of Linux.
Here we want to issue the following command:
sudo apt-get update
This command tells the package management utility apt-get to check in with the configured repositories and check for any updates for installed software.
Reference: Ubuntu Unleashed 2008 Edition
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