When I boot into Linux, I get this:

Error: unknown command 'gfxmode'. Pressing any key continues

It takes about 5 secs to boot after that. Pretty slow compared to 11.10, I think. Anyway, my Ubuntu is 12.04 and it just updated today and changed the grub with grubcustomizer. Anyway, I don't want any gfx interface or resolution on the grub customizer, but it keeps giving that error even if it isn't marked in grub customizer.

I found some help here, in this question: Error: unknown command 'gfxmode'. Pressing any key continues

I found the line it mentions in the 00_header. But Set is found in front of the gfx there, so that isn't actually the problem.

This is my /etc/default/grub:

# If you change this file, run 'update-grub' afterwards to update

# /boot/grub/grub.cfg.

# For full documentation of the options in this file, see:

#   info -f grub -n 'Simple configuration'



GRUB_DEFAULT="saved"

#GRUB_HIDDEN_TIMEOUT="0"

GRUB_HIDDEN_TIMEOUT_QUIET="true"

GRUB_TIMEOUT="10"

GRUB_DISTRIBUTOR="`lsb_release -i -s 2> /dev/null || echo Debian`"

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

GRUB_CMDLINE_LINUX=""



# Uncomment to enable BadRAM filtering, modify to suit your needs

# This works with Linux (no patch required) and with any kernel that obtains

# the memory map information from GRUB (GNU Mach, kernel of FreeBSD ...)

#GRUB_BADRAM="0x01234567,0xfefefefe,0x89abcdef,0xefefefef"



# Uncomment to disable graphical terminal (grub-pc only)

#GRUB_TERMINAL="console"



# The resolution used on graphical terminal

# note that you can use only modes which your graphic card supports via VBE

# you can see them in real GRUB with the command `vbeinfo'

#GRUB_GFXMODE="1024x768x24"



# Uncomment if you don't want GRUB to pass "root=UUID=xxx" parameter to Linux

#GRUB_DISABLE_LINUX_UUID="true"



# Uncomment to disable generation of recovery mode menu entries

#GRUB_DISABLE_RECOVERY="true"



# Uncomment to get a beep at grub start

#GRUB_INIT_TUNE="480 440 1"



GRUB_SAVEDEFAULT="true"