Download Ubuntu Server 20.04 from here: https://ubuntu.com/download/server choosing option 3

Either set up a virtual machine or insert the disk onto a physical machine.

Once you get to this screen, you will be asked to pick your local language on this screen

Highlight it, and click enter.

Next, you will be asked to select your keybaord and layout. again highlight, and click enter

Next, you choose whetther you want your router to provide a local IP address, or whetehr you want to provide a staic one:

This screen is for DHCP:

This one is for static IP addres but click on Manual to do so:

Then once the network has been added, click enter, then add proxy address, if you are hiding behind a proxy:

Click enter

Next, you will be asked to sort out storage, for best reults, use an entire disk, deselect 'Setup this disk as an LVM group' unless you know what you are doing!

Once you have set up your storage, click on 'Continue' to write the changes to the disk.

Next, you will be asked to add the first profile to the server, so just fill in the answers on this screen.

So you can remote access the server from another machine on your network, install ssh

You will then come to the 'snaps install' screen - for the basis of this wiki, we will NOT be using snaps, so if you are following, leave ALL unchecked.

And click on done.

Once you have done all this, you should end up with this screen

Once the installation has finished, remover the disk/USB or unmount iso, and then reboot.