1st time user. I used Rufus to create a USB boot disk with ubuntu-18.04.4-desktop-amd64.iso. Upon [Restart] Ubuntu stalls at a blank purple-orange-rabbit screen. I tried downloading the file and recreating boot disk 3 times on two different USB drives. Ran Malwarebytes - no errors or issues. Running on Windows 10 version 1803 desktop with AMD processor. My system meets all Ubuntu system requirements. FYI: Windows 10 version 1903 update will not install on my system either? That's the reason I decided to try Ubuntu. Thanks for any help, Rob