Ubuntu is a linux distribution and is the most friendliest towards the user amongst all the other flavors. It should come with ssh already installed on it For most linux distros, you need to use sudo as it will elavate your previlages to root temporarly because it is not always good to be root... unless you know what you're doing

These are the typical commands you must know when using ubuntu:

For updating:


                        sudo apt-get update

For upgrading packages:


                        sudo apt-get upgrade

clearing out cache


                        sudo apt-get autoclean

Removing out dated packages:


                        sudo apt-get autoremove

For searching packages:

 
                    sudo apt-cache search "name of package"

To list all packages installed on system:


                    sudo apt list --installed