Grub fails after upgrade from 13.10 to 14.04. I get an endless loop of the bios splash and grub is not starting.
Pressing <escape> stop the loop and shows a bios menu (not grub!) where I see the label "ubuntu" which I can select and boot the system apparently without going through grub.
The disk is GPT, with an EFI partition mounted as /boot/efi. The system is indeed succesfully booting EFI, as confirmed by dmesg |grep "efi\|EFI" and existence of /sys/firmware/efi.
Purging grub and reinstalling did not help. I installed boot-repair from Saucy but it did not fix the problem, here the pastebin output. Apparently the BIOS is supporting EFI booting but there must be something wrong in the grub configuration I got after the update to 14.04. Since my knowledge of grub and efi business is quite limited, it might well be something very basic.
Right now I have only Ubuntu running, but still I would like to keep EFI instead of Legacy mode.
The laptop is a Samsung 900X3A, bios version 08HL (11/17/2012)