if you want to install Ubuntu OS on the computer I would like to give a simple how to as following.
Have PC for install the software.
Have Ubuntu sofeware download from https://ubuntu.com/download/server
Have USB or DVD image based physical install
Check you PC requirement
make sure you have at least 2GB of free storage space.DVD or a USB flash drive containing the version of Ubuntu Server you want to install.
Normally computers will automatically boot from USB or DVD, however, If you don’t see the boot message and the “Welcome” screen which should appear after it, you will need to set your computer to boot from the install media.
There should be an on-screen message when the computer starts telling you what key to press for settings or a boot menu. Depending on the manufacturer, this could be Escape, F2,F10 or F12. Simply restart your computer and hold down this key until the boot menu appears, then select the drive with the Ubuntu install media.
Configure storage
The next step is to configure storage. The recommended install is to have an entire disk or partition set aside for running Ubuntu.