Restarts boots into BIOS. Turn off/on boots into Linux

Question

On a fitlet-H PC I have installed a brand new SSD SAMSUNG 870 EVO 1 TB. I have tried installing both Linux Mint and Ubuntu MATE and I have the same boot issue.

1. If I turn off the PC and then turns it on it boots fine into Linux OS.
2. If I restarts the OS, the PC boots into the BIOS. Using "Save & Exit" boots into the BIOS again. I have to turn off the PC to boot into OS.

I have tried all kind of "Boot Orders" in the BIOS, but the problem continues (picture is the current)

I have tried resetting BIOS to defaults

I have upgraded the BIOS firmware to newest version.

After turn off/on and pressing DEL to enter BIOS Ubuntu is listed as below. This disappears again after next restart.

Answer 1

I think it's a bug in the BIOS/UEFI firmware and you can do nothing. But you can optimize the settings and give it a try:

• disable PXE boot
• disable CSM support
• move the HDD boot option to the very top

You can also check your Samsung SSD for firmware updates.

Also when you restarted the PC and it boots into BIOS you can analyse the problem a little more. Insert an Ubuntu USB boot stick and run lsblk to see if the SSD is there. Run dd to see if it's readable (replace sda with your disk):

sudo dd if=/dev/sda of=/dev/null count=1024 status=progress

You could also give it a try and roll back to an older BIOS version. But that may be blocked.

Also you could install the OSes in BIOS mode instead of UEFI but that isn't really satisfying either.