No Bootable Devices Found After Ubuntu Installation on Dell

I'm trying to install Ubuntu on a Dell Latitude 5490. Ubuntu will be the only OS I use on this computer

Steps I've taken:

• Used Rufus to put DBAN on a flash drive and autonuke C: drive
• Used Rufus to put ubuntu-20.04.3-desktop-amd64.iso on a flash drive
• Booted from flash drive, Try Ubuntu works well
• Installed Ubuntu, appeared to succeed
• Upon restart, computer shows "No bootable devices found"
• Dell Diagnostics indicates all hardware is working correctly/found
• Enabled Secure Boot, and attempted to define a UEFI Boot Option for Boot Sequence. The EFI Boot Selection screen for selecting a file shows :FSO but is otherwise blank. When I manually enter the file \EFI\ubuntu\grubx64.efi, I still get the "No bootable devices found" screen (disabling Secure Boot and booting from Legacy Option ROMs also failed)
• I tried running boot-repair from Try Ubuntu, which I saw in another post. It ran successfully but still same error upon restart
• I reinstalled Ubuntu from flash drive, and it does see that Ubuntu is already installed. I re-did the installation anyway but still same issue

I feel like I'm running out of ideas on what to try next and would love any advice. Thank you!

1 Answer

I had/have the same problem. I found that if I tap F12 to get the boot menu, it shows my M.2 SSD drive as an option. If I select that, it boots every time. I have no idea why this works, as I've never seen this behavior before.