1. Download the ISO for the latest version of Ubuntu 18.04 LTS
You most likely want the 64-bit PC (AMD64) desktop image.
2. Create a bootable Ubuntu disk
If you are on a Ubuntu machine (not 18.04 LTS):
If you are on a Windows machine:
If you are on a macOS machine:
3. Once the system is booted using the bootable disk, choose "Install Ubuntu"
4. Choose "Normal Installation"
5. Choose "Erase Disk and Install Ubuntu"
6. Create and enter your login name, computer name, username, and password
7. You are now installing Ubuntu 18.04 LTS. This will take around 5-10 minutes depending on the speed of your computer
8. Once the installation is complete, remove the USB/DVD from the drive and restart your system
9. Your Ubuntu installation is ready!