Il file grub.conf non l'ho trovato, intendevi il grub cfg? se si eccolo, se no cancello subito questa risposta 
codice:
#
# DO NOT EDIT THIS FILE
#
# It is automatically generated by grub-mkconfig using templates
# from /etc/grub.d and settings from /etc/default/grub
#
### BEGIN /etc/grub.d/00_header ###
if [ -s $prefix/grubenv ]; then
set have_grubenv=true
load_env
fi
set default="0"
if [ x"${feature_menuentry_id}" = xy ]; then
menuentry_id_option="--id"
else
menuentry_id_option=""
fi
export menuentry_id_option
if [ "${prev_saved_entry}" ]; then
set saved_entry="${prev_saved_entry}"
save_env saved_entry
set prev_saved_entry=
save_env prev_saved_entry
set boot_once=true
fi
function savedefault {
if [ -z "${boot_once}" ]; then
saved_entry="${chosen}"
save_env saved_entry
fi
}
function recordfail {
set recordfail=1
if [ -n "${have_grubenv}" ]; then if [ -z "${boot_once}" ]; then save_env recordfail; fi; fi
}
function load_video {
if [ x$feature_all_video_module = xy ]; then
insmod all_video
else
insmod efi_gop
insmod efi_uga
insmod ieee1275_fb
insmod vbe
insmod vga
insmod video_bochs
insmod video_cirrus
fi
}
if [ x$feature_default_font_path = xy ] ; then
font=unicode
else
insmod part_msdos
insmod ext2
set root='hd0,msdos4'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos4 --hint-efi=hd0,msdos4 --hint-baremetal=ahci0,msdos4 0237e26f-0603-4511-b329-ce9d2de09f5d
else
search --no-floppy --fs-uuid --set=root 0237e26f-0603-4511-b329-ce9d2de09f5d
fi
font="/usr/share/grub/unicode.pf2"
fi
if loadfont $font ; then
set gfxmode=auto
load_video
insmod gfxterm
set locale_dir=$prefix/locale
set lang=it_IT
insmod gettext
fi
terminal_output gfxterm
if [ "${recordfail}" = 1 ]; then
set timeout=-1
else
set timeout=10
fi
### END /etc/grub.d/00_header ###
### BEGIN /etc/grub.d/05_debian_theme ###
set menu_color_normal=white/black
set menu_color_highlight=black/light-gray
if background_color 44,0,30; then
clear
fi
### END /etc/grub.d/05_debian_theme ###
### BEGIN /etc/grub.d/10_linux ###
function gfxmode {
set gfxpayload="${1}"
if [ "${1}" = "keep" ]; then
set vt_handoff=vt.handoff=7
else
set vt_handoff=
fi
}
if [ "${recordfail}" != 1 ]; then
if [ -e ${prefix}/gfxblacklist.txt ]; then
if hwmatch ${prefix}/gfxblacklist.txt 3; then
if [ ${match} = 0 ]; then
set linux_gfx_mode=keep
else
set linux_gfx_mode=text
fi
else
set linux_gfx_mode=text
fi
else
set linux_gfx_mode=keep
fi
else
set linux_gfx_mode=text
fi
export linux_gfx_mode
if [ "${linux_gfx_mode}" != "text" ]; then load_video; fi
menuentry 'Ubuntu' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-simple-0237e26f-0603-4511-b329-ce9d2de09f5d' {
recordfail
gfxmode $linux_gfx_mode
insmod gzio
insmod part_msdos
insmod ext2
set root='hd0,msdos4'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos4 --hint-efi=hd0,msdos4 --hint-baremetal=ahci0,msdos4 0237e26f-0603-4511-b329-ce9d2de09f5d
else
search --no-floppy --fs-uuid --set=root 0237e26f-0603-4511-b329-ce9d2de09f5d
fi
linux /boot/vmlinuz-3.5.0-17-generic root=UUID=0237e26f-0603-4511-b329-ce9d2de09f5d ro quiet splash $vt_handoff
initrd /boot/initrd.img-3.5.0-17-generic
}
submenu 'Opzioni avanzate per Ubuntu' $menuentry_id_option 'gnulinux-advanced-0237e26f-0603-4511-b329-ce9d2de09f5d' {
menuentry 'Ubuntu, con Linux 3.5.0-17-generic' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-3.5.0-17-generic-advanced-0237e26f-0603-4511-b329-ce9d2de09f5d' {
recordfail
gfxmode $linux_gfx_mode
insmod gzio
insmod part_msdos
insmod ext2
set root='hd0,msdos4'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos4 --hint-efi=hd0,msdos4 --hint-baremetal=ahci0,msdos4 0237e26f-0603-4511-b329-ce9d2de09f5d
else
search --no-floppy --fs-uuid --set=root 0237e26f-0603-4511-b329-ce9d2de09f5d
fi
echo 'Caricamento Linux 3.5.0-17-generic...'
linux /boot/vmlinuz-3.5.0-17-generic root=UUID=0237e26f-0603-4511-b329-ce9d2de09f5d ro quiet splash $vt_handoff
echo 'Caricamento ramdisk iniziale...'
initrd /boot/initrd.img-3.5.0-17-generic
}
menuentry 'Ubuntu, con Linux 3.5.0-17-generic (modalità ripristino)' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-3.5.0-17-generic-recovery-0237e26f-0603-4511-b329-ce9d2de09f5d' {
recordfail
insmod gzio
insmod part_msdos
insmod ext2
set root='hd0,msdos4'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos4 --hint-efi=hd0,msdos4 --hint-baremetal=ahci0,msdos4 0237e26f-0603-4511-b329-ce9d2de09f5d
else
search --no-floppy --fs-uuid --set=root 0237e26f-0603-4511-b329-ce9d2de09f5d
fi
echo 'Caricamento Linux 3.5.0-17-generic...'
linux /boot/vmlinuz-3.5.0-17-generic root=UUID=0237e26f-0603-4511-b329-ce9d2de09f5d ro recovery nomodeset
echo 'Caricamento ramdisk iniziale...'
initrd /boot/initrd.img-3.5.0-17-generic
}
}
### END /etc/grub.d/10_linux ###
### BEGIN /etc/grub.d/20_linux_xen ###
### END /etc/grub.d/20_linux_xen ###
### BEGIN /etc/grub.d/20_memtest86+ ###
### END /etc/grub.d/20_memtest86+ ###
### BEGIN /etc/grub.d/30_os-prober ###
menuentry 'Windows 8 (loader) (su /dev/sda1)' --class windows --class os $menuentry_id_option 'osprober-chain-306802126801D80C' {
insmod part_msdos
insmod ntfs
set root='hd0,msdos1'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1 306802126801D80C
else
search --no-floppy --fs-uuid --set=root 306802126801D80C
fi
drivemap -s (hd0) ${root}
chainloader +1
}
### END /etc/grub.d/30_os-prober ###
### BEGIN /etc/grub.d/30_uefi-firmware ###
menuentry 'System setup' $menuentry_id_option 'uefi-firmware' {
fwsetup
}
### END /etc/grub.d/30_uefi-firmware ###
### BEGIN /etc/grub.d/40_custom ###
# This file provides an easy way to add custom menu entries. Simply type the
# menu entries you want to add after this comment. Be careful not to change
# the 'exec tail' line above.
menuentry 'Esci da GRUB UEFI ed avvia Windows8' {
exit
}
### END /etc/grub.d/40_custom ###
### BEGIN /etc/grub.d/41_custom ###
if [ -f ${config_directory}/custom.cfg ]; then
source ${config_directory}/custom.cfg
elif [ -z "${config_directory}" -a -f $prefix/custom.cfg ]; then
source $prefix/custom.cfg;
fi
### END /etc/grub.d/41_custom ###
Problema booting Windows 8 e Ubuntu 12.10
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