I am trying to install Linux on an HP laptop (8570p Elitebook, Bios 68ICF Ver. F.68). It has a Samsung EVO 850 SSD (256 GB). This laptop had Windows 10 before, which worked without any problem. I installed Linux/Ubuntu from an USB stick, onto the SSD. Booting from this USB worked fine and the whole install process also ran smooth.
However, after powering down, removing the stick and booting, the BIOS gives the above error, indicating it cannot find an OS...
When I boot from the USB, it shows an Ubuntu installation on the SSD...
I tried a second time to install it, this time not having it select the target drive automatically, but rather selecting the disk, erasing all partitions, adding a new one, then installing it there. But still the same error...
This laptop was manufactured in 2003, so it may be too old, but it was running fine on windows 10 and I would like to try Linux.
Any help is appreciated.