Ubuntu-Server 20.04.3 installer immediately crashes

TL;DR: Ubuntu-Server immediately crashes after installer loads, I'm in desperate need for some help, details below

So I need an Ubuntu-Server rather urgently and was given some random hardware that was lying around. It's a Dell Power Edge 230 with only 8GB of RAM, and a 3Ghz Quad core. I haven't yet figured out what the RAID config is or what drives are installed (if you have any pointers on what information to look for and how, feel free to share).

Here is what I've done so far: Used this tutorial to make a bootable Flash-Drive, than plugged it into the rear USB port of my Server, pressed F11 to load boot Manager, selected One-Shot BIOS Boot menu, selected USB-Drive;

Now onto the the Problem, when I select the drive it goes on to boot Ubuntu, starting with this whole screen in the dark purple-ish ubuntu color and a logo of a keyboard, an arrow and a person (wich I've never seen before), then it loads the regular stuff (cloud init etc) and then gives me the select language screen, after a few seconds (no matter if I interact or not) it displays a message saying that an unknown error occurred

Ive tried with different USB-Drives same result

If you need some more info, let me know

I would really appreciate some advice, or what you have done if you've had this problem

TL;DR: Ubuntu-Server immediately crashes after installer loads, I'm in desperate need for some help

If you have the release image (downloaded directly from the Ubuntu website), try using the daily CD image.

You can find daily images at http://cdimage.ubuntu.com.

The current Ubuntu Server daily image for the legacy installer is here. the current Ubuntu Server daily image for thew new installer is here.

Also be sure to check the checksum of any downloaded image, to make sure the image wasn't corrupted during download.