Command line for updating ubuntu
To open your Terminal Window, click on your ubuntu icon and type in terminal in the text box provided Or just use your keyboard short cut ( ).This will open up a command line like window, with which you can perform linux administrative tasks.This guide shows how to find, install and manage applications using the apt-get command.You certainly do not want a vulnerable and unpatched server facing the internet; even if its running Linux.Best to not do this over SSH in case something goes wrong, but the upgrade process will open a non-standard SSH port for you (it alerts you to this) if you don't want to be or can't be by the machine.
The apt-get is the command-line tool for handling packages, and may be considered the user’s “back-end” to other tools using the APT library.
Debian packages (and Ubuntu of course) can be managed from command line using the package manager “apt”.
There is also a menu-driven, text-based frontend to apt, which is called “aptitude”.
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This will update everything in the distro to the latest that is in the repos you have enabled.