(I cross-posted this on the Ubuntu forums but thought I would also try here in case someone has seen this before)
I have a new NUC8i5BEK with a 500GB M2 Samsung 970 and a single stick of Crucial 2400MHz 16GB RAM that is updated to the latest 2018/11/28 BIOS/Firmware. With both the 18.04 and 18.10 server ISO images I am able to boot via USB just fine, but once it gets to the language selection menu, the screen flashes back briefly to a grey background one with a single line of text at the top that says something to the effect of "Ubuntu Server 18.xx LTS", and then returns to the language selection menu again for a second or two. I think the grey screen is the installation menu app starting up and basically this app is restarting every second or two. If you hit enter quickly, you can get through a page or two of the menus, but it always restarts so you can never complete anything. I have had one or two instances where after leaving it cycling like this for a half-hour or so, it eventually stops and you can interact with the menus, but once I go past the networking selection screen it restarts again. I want to emphasize that the machine is not rebooting back to grub, etc. - it is very quickly hopping between the installation menu screen and this grey screen.
Has anyone seen this behavior before? I would think if I had a bad hardware or BIOS configuration it wouldn't get this far.
Thanks. After letting the 18.10 server installer to restart itself every second for maybe 15min, it seemed to stop and I was able to proceed through the installer and everything is now working fine. I tried doing the same with the 18.04 server installer but it just kept resetting itself ad nauseam. Once 18.10 was working I was able to downgrade it via apt back to 18.04. The NUC seems totally stable otherwise so I don't think this was a hardware / config issue, just an Ubuntu installer one.