Apt is a monster of a tool. It can help you stay right on the cutting edge with little or no effort on your part.
Let’s say, for example, you’ve had an Ubuntu installation running for a while, but you want to install the latest version of the OS. You need to do a full backup, burn a new disc, sit through a reinstallation process and cross your fingers, right? Wrong.
sudo apt-get distupgrade
to bring your installed distro in line with current standards automatically.