GRand Unified Bootloader it is the software responsible for loading and transferring control to the operating system kernel during the initial boot. On the Koala Karmic is using GRUB version 2. On this version there is a bit different on file configuration. On last version, all of the GRUB configuration can we see on file '/boot/grub/menu.list'. On this version, the configuration file is on this path :
This file contain GRUB setting variable. You can make any change setting of this variable to make the GRUB running as you want. Beware that after you editing this file, you must running the update-grub syntax on console to update the GRUB setting.
If you want to change the list of the Boot Menu, you can edit on this path :
sonic2epix@matrix:~$ sudo gedit /boot/grub/grub.cfg
#
# DO NOT EDIT THIS FILE
#
# It is automatically generated by /usr/sbin/grub-mkconfig using templates
# from /etc/grub.d and settings from /etc/default/grub
#
### BEGIN /etc/grub.d/00_header ###
if [ -s /boot/grub/grubenv ]; then
have_grubenv=true
load_env
fi
set default="0"
if [ ${prev_saved_entry} ]; then
saved_entry=${prev_saved_entry}
save_env saved_entry
prev_saved_entry=
save_env prev_saved_entry
fi
insmod ext2
set root=(hd0,1)
search --no-floppy --fs-uuid --set 15ed4e71-1d78-4ed8-9855-3b3771861ce9
if loadfont /usr/share/grub/unicode.pf2 ; then
set gfxmode=640x480
insmod gfxterm
insmod vbe
if terminal_output gfxterm ; then true ; else
# For backward compatibility with versions of terminal.mod that don't
# understand terminal_output
terminal gfxterm
fi
fi
if [ ${recordfail} = 1 ]; then
set timeout=-1
else
set timeout=3
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/white
### END /etc/grub.d/05_debian_theme ###
### BEGIN /etc/grub.d/10_linux ###
menuentry "Ubuntu, Linux 2.6.31-14-generic" {
recordfail=1
if [ -n ${have_grubenv} ]; then save_env recordfail; fi
set quiet=1
insmod ext2
set root=(hd0,1)
search --no-floppy --fs-uuid --set 15ed4e71-1d78-4ed8-9855-3b3771861ce9
linux /boot/vmlinuz-2.6.31-14-generic root=UUID=15ed4e71-1d78-4ed8-9855-3b3771861ce9 ro quiet splash
initrd /boot/initrd.img-2.6.31-14-generic
}
menuentry "Ubuntu, Linux 2.6.31-14-generic (recovery mode)" {
recordfail=1
if [ -n ${have_grubenv} ]; then save_env recordfail; fi
insmod ext2
set root=(hd0,1)
search --no-floppy --fs-uuid --set 15ed4e71-1d78-4ed8-9855-3b3771861ce9
linux /boot/vmlinuz-2.6.31-14-generic root=UUID=15ed4e71-1d78-4ed8-9855-3b3771861ce9 ro single
initrd /boot/initrd.img-2.6.31-14-generic
}
### END /etc/grub.d/10_linux ###
### BEGIN /etc/grub.d/20_memtest86+ ###
menuentry "Memory test (memtest86+)" {
linux16 /boot/memtest86+.bin
}
menuentry "Memory test (memtest86+, serial console 115200)" {
linux16 /boot/memtest86+.bin console=ttyS0,115200n8
}
### END /etc/grub.d/20_memtest86+ ###
### BEGIN /etc/grub.d/30_os-prober ###
menuentry "Windows Vista (loader) (on /dev/sda2)" {
insmod ntfs
set root=(hd0,2)
search --no-floppy --fs-uuid --set 5220fd0220fcedbb
chainloader +1
}
if [ ${timeout} != -1 ]; then
if sleep --interruptible 3 ; then
set timeout=0
fi
fi
### END /etc/grub.d/30_os-prober ###
### BEGIN /etc/grub.d/40_custom ###
# This file provides an easy way to add custom menu entries. Simply type the
# menu entries you want to add after this comment. Be careful not to change
# the 'exec tail' line above.
### END /etc/grub.d/40_custom ###
If you want to hide the boot menu on GRUB 2, you must do little more things like this one.
sonic2epix@matrix:~$ sudo gedit /etc/grub.d/30_os-prober
adjust_timeout () {
if [ "x${found_other_os}" = "x" ] ; then
if [ "x${GRUB_HIDDEN_TIMEOUT}" != "x" ] ; then
if [ "x${GRUB_HIDDEN_TIMEOUT_QUIET}" = "xtrue" ] ; then
verbose=
else
verbose=" --verbose"
fi
if [ "x${GRUB_HIDDEN_TIMEOUT}" = "x0" ] ; then
cat <<EOF
if [ \${timeout} != -1 ]; then
if keystatus; then
if keystatus --shift; then
set timeout=-1
else
set timeout=0
fi
else
if sleep$verbose --interruptible 3 ; then
set timeout=0
fi
fi
fi
EOF
else
cat << EOF
if [ \${timeout} != -1 ]; then
if sleep$verbose --interruptible ${GRUB_HIDDEN_TIMEOUT} ; then
set timeout=0
fi
fi
EOF
fi
fi
fi
}
Replace the script on the line 28-29 become this one :
if [ "x${found_other_os}" = "x" ] || [ "x${GRUB_HIDDEN_TIMEOUT}" != "x" ] ; then
Delete the script 'fi' on the line 61. Make sure you uncomment the variable 'GRUB_HIDDEN_TIMEOUT' on the '/etc/default/grub' to enable the Hidden Boot Menu and then restart your computer to see the different.
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