To be sure you are using the most current version of your Operating System (very important, as updates happen very often and include security updates as well as bug fixes) You only need to issue a few simple commands via SSH or terminal.
To open a terminal session, click the start menu and select the pre-installed terminal (putty is a great place to start.
To update the repository lists and packages you need to type in :
“sudo apt-get update”
the command “sudo” gives the command root privileges while “apt-get update” updates your repositories used to download and install packages from.
To update the system type in:
“sudo apt-get upgrade” you may have to confirm or deny (if more disk space will be used) by pressing “y” and hitting enter/return you agree, hitting “n” and return/enter you decline and stop the installation.