Dear Maintainer,

   * What led up to the situation?

Installation of LMDE (based upon debian testing),
on a preinstalled win8 machine with uefi boot.
errors on boot, in the end the message booting anyway
(file not found, mode not supported)

   * What exactly did you do (or not do) that was effective (or
     ineffective)?

Solution:
outcomment
	insmod vga
	insmod vbe
and replace with
	insmod efi_gob
        insmod efi_uga
	insmod font
Change the resolution to a higher one in grub.cfg (for the mode not supported)

   * What was the outcome of this action?

no visible errors on boot

This could be a single case, but could it be that vga en vbe should not be present
by default in the grub.cfg for efi version of grub.

mvg,
Wim Bertels