Context
My Asus laptop had Endless OS installed and I wanted to switch to Ubuntu 18. So I followed the instructions to install Ubuntu in the machine, erasing all of the Endless OS (no dual boot). I was able to get to the bios, changed the boot order and installed Ubuntu (it went through a complete install).
The Problem
When I restarted, the computer went directly to the bios utility screen, which had no boot options and showed me a "the system cannot find any bootable devices" message.
I'm able to access Ubuntu through the "try Ubuntu" option on install when the USB is left on (so my computer can indeed boot from USB). The problem is booting without an USB.
What I already have tried (and found):
Information is overall disperse and most of it is related to windows. There are a lot of dead threads and I couldn't find anything similar in askUbuntu.
Most of the posts / videos direct me to setting UEFI, but the bios utility doesn't seem to have such an option.
All possible combinations of CSM support and Fast Boot
None of these have worked.
Questions:
How can I get a list of bootable devices?
How can I get my machine to boot again?