В UEFI стоят такие параметры
boot option
1.Ubuntu
2.Hitachi XXXXXX(на нем стоит Win 8.1)
3.СD-ROM
FAST BOOT(Enable)
VGA Driver EFI Driver
Next Boot after ac power(loss)
OS type (windows

, есть еще otheros и windows 8 whql
CSM Support(Always)
Boot Mode Selection(UEFI and Legacy)
Strotage Boot option Control (Legacy Only)
Other PCI Device Rom Priority(UEFI op ROM)
Secure Boot(Enable)
Secure BootMode(Standart)
По del вызывается grub, но там только ubuntu, вход в EFI и доп.загрузки в них нет винды
grub-install (GRUB) 2.00-19ubuntu2.1
alexsx06@alexsx06-To-be-filled-by-O-E-M:~$ cat /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=0
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=640x480
# 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"