The PC is Acer with Windows 10. Bought last year and reinstalled with Ubuntu 16. I tried Ubuntu 17 after it came out. Everything was fine until I accidently used some upgrade from Software Center. Now everytime I hit the power button, it flashes:
System BootOrder not found. Initializing defaults.
Creating boot entry 'Boot0038' with label 'ubuntu' for file
'\EFI\ubuntu\shimx64.efi'.
Reset system
And it immediately powers off itself and restarts to repeat the failure. I can only boot from a bootable USB-stick in legacy boot mode.
I know I shouldn't use the upgrade so carelessly but can someone help me out.