Update 2019-05-21 19:37 EST: My motherboard is on the latest BIOS available, released 2019-03-06, but still has the install problems described below.
Update: I burned the Arch ISO to a CD then tried booting from it, both in UEFI and legacy. Same type of result:
Original question: I used
dd to put this Arch ISO (Version 2019.05.02) on a USB stick, then attempted to boot from it on my desktop computer. When the Arch menu comes up, I choose "Boot Arch Linux (x86_64)." But what follows is a bunch of error messages, then the process just hangs there doing nothing. Here's a pic:
The messages start off as "AMD-Vi: Completion-Wait loop timed out"
The messages include "kernel panic."
My motherboard is an MSI B450 Tomahawk with a Ryzen 5 2600 CPU. I've tried booting via UEFI and legacy with the same result.
How do I install Arch Linux?