Re: Grub2 and multiple boot different ubuntu versions



On 03/24/2010 06:25 PM, Goh Lip wrote:
On 03/25/2010 05:25 AM, Colin Law wrote:


Many thanks to all for the suggestions, I have learned a lot from
working through them. I hope you will all not be upset if I decide to
wimp out and just live with what I have, editing /etc/default/grub
occasionally as required. I think possibly the possibility of causing
myself grief outweighs the benefit.


Very good point. Precisely; it's not much of a hassle just editing
grub.cfg (not even /etc/default/grub and update-grub).

So how would you advise a standard multiboot user to edit this:

#
# 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 $prefix/grubenv ]; then
load_env
fi
set default="7"
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 ${boot_once} ]; then save_env recordfail; fi; fi
}
insmod ext2
set root='(hd0,8)'
search --no-floppy --fs-uuid --set <snipped>
if loadfont /usr/share/grub/unicode.pf2 ; then
set gfxmode=640x480
insmod gfxterm
insmod vbe
if terminal_output gfxterm ; then true ; else
# For backward compatibility with versions of terminal.mod that don't
# understand terminal_output
terminal gfxterm
fi
fi
insmod ext2
set root='(hd0,8)'
search --no-floppy --fs-uuid --set <snipped>
set locale_dir=($root)/boot/grub/locale
set lang=en
insmod gettext
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
### END /etc/grub.d/05_debian_theme ###

### BEGIN /etc/grub.d/10_linux ###
menuentry "Ubuntu, with Linux 2.6.32-17-generic" --class ubuntu --class gnu-linux --class gnu --class os {
recordfail
insmod ext2
set root='(hd0,8)'
search --no-floppy --fs-uuid --set <snipped>
linux /boot/vmlinuz-2.6.32-17-generic root=UUID=<snipped> ro quiet splash
initrd /boot/initrd.img-2.6.32-17-generic
}
menuentry "Ubuntu, with Linux 2.6.32-17-generic (recovery mode)" --class ubuntu --class gnu-linux --class gnu --class os {
recordfail
insmod ext2
set root='(hd0,8)'
search --no-floppy --fs-uuid --set <snipped>
echo Loading Linux 2.6.32-17-generic ...
linux /boot/vmlinuz-2.6.32-17-generic root=UUID=<snipped> ro single
echo Loading initial ramdisk ...
initrd /boot/initrd.img-2.6.32-17-generic
}
menuentry "Ubuntu, with Linux 2.6.32-16-generic" --class ubuntu --class gnu-linux --class gnu --class os {
recordfail
insmod ext2
set root='(hd0,8)'
search --no-floppy --fs-uuid --set <snipped>
linux /boot/vmlinuz-2.6.32-16-generic root=UUID=<snipped> ro quiet splash
initrd /boot/initrd.img-2.6.32-16-generic
}
menuentry "Ubuntu, with Linux 2.6.32-16-generic (recovery mode)" --class ubuntu --class gnu-linux --class gnu --class os {
recordfail
insmod ext2
set root='(hd0,8)'
search --no-floppy --fs-uuid --set <snipped>
echo Loading Linux 2.6.32-16-generic ...
linux /boot/vmlinuz-2.6.32-16-generic root=UUID=<snipped> ro single
echo Loading initial ramdisk ...
initrd /boot/initrd.img-2.6.32-16-generic
}
### END /etc/grub.d/10_linux ###

### BEGIN /etc/grub.d/20_memtest86+ ###
menuentry "Memory test (memtest86+)" {
insmod ext2
set root='(hd0,8)'
search --no-floppy --fs-uuid --set <snipped>
linux16 /boot/memtest86+.bin
}
menuentry "Memory test (memtest86+, serial console 115200)" {
insmod ext2
set root='(hd0,8)'
search --no-floppy --fs-uuid --set <snipped>
linux16 /boot/memtest86+.bin console=ttyS0,115200n8
}
### END /etc/grub.d/20_memtest86+ ###

### BEGIN /etc/grub.d/30_os-prober ###
menuentry "Windows 7 (loader) (on /dev/sda1)" {
insmod ntfs
set root='(hd0,1)'
search --no-floppy --fs-uuid --set <snipped>
chainloader +1
}
menuentry "Ubuntu, Linux 2.6.31-20-generic (on /dev/sda5)" {
insmod ext2
set root='(hd0,5)'
search --no-floppy --fs-uuid --set <snipped>
linux /boot/vmlinuz-2.6.31-20-generic root=UUID=<snipped> ro quiet splash
initrd /boot/initrd.img-2.6.31-20-generic
}
menuentry "Ubuntu, Linux 2.6.31-20-generic (recovery mode) (on /dev/sda5)" {
insmod ext2
set root='(hd0,5)'
search --no-floppy --fs-uuid --set <snipped>
linux /boot/vmlinuz-2.6.31-20-generic root=UUID=<snipped> ro single
initrd /boot/initrd.img-2.6.31-20-generic
}
menuentry "Ubuntu, Linux 2.6.31-19-generic (on /dev/sda5)" {
insmod ext2
set root='(hd0,5)'
search --no-floppy --fs-uuid --set <snipped>
linux /boot/vmlinuz-2.6.31-19-generic root=UUID=<snipped> ro quiet splash
initrd /boot/initrd.img-2.6.31-19-generic
}
menuentry "Ubuntu, Linux 2.6.31-19-generic (recovery mode) (on /dev/sda5)" {
insmod ext2
set root='(hd0,5)'
search --no-floppy --fs-uuid --set <snipped>
linux /boot/vmlinuz-2.6.31-19-generic root=UUID=<snipped>e ro single
initrd /boot/initrd.img-2.6.31-19-generic
}
menuentry "Ubuntu, linux 2.6.24-27-generic (on /dev/sda7)" {
insmod ext2
set root='(hd0,7)'
search --no-floppy --fs-uuid --set <snipped>
linux /boot/vmlinuz-2.6.24-27-generic root=UUID=<snipped> ro quiet splash
initrd /boot/initrd.img-2.6.24-27-generic
}
menuentry "Ubuntu, linux 2.6.24-27-generic (single-user mode) (on /dev/sda7)" {
insmod ext2
set root='(hd0,7)'
search --no-floppy --fs-uuid --set <snipped>
linux /boot/vmlinuz-2.6.24-27-generic root=UUID=<snipped> ro single
initrd /boot/initrd.img-2.6.24-27-generic
}
menuentry "Ubuntu, linux 2.6.24-26-generic (on /dev/sda7)" {
insmod ext2
set root='(hd0,7)'
search --no-floppy --fs-uuid --set <snipped>
linux /boot/vmlinuz-2.6.24-26-generic root=UUID=<snipped> ro quiet splash
initrd /boot/initrd.img-2.6.24-26-generic
}
menuentry "Ubuntu, linux 2.6.24-26-generic (single-user mode) (on /dev/sda7)" {
insmod ext2
set root='(hd0,7)'
search --no-floppy --fs-uuid --set <snipped>
linux /boot/vmlinuz-2.6.24-26-generic root=UUID=<snipped> ro single
initrd /boot/initrd.img-2.6.24-26-generic
}
menuentry "Memory test (memtest86+) (on /dev/sda7)" {
insmod ext2
set root='(hd0,7)'
search --no-floppy --fs-uuid --set <snipped>
linux /boot/memtest86+.bin
}
### 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 ###

to simply edit out the memtest bits? Would I take the chance of deleting a:

}
menuentry "Memory test (memtest86+) (on /dev/sda7)" {
insmod ext2
set root='(hd0,7)'
search --no-floppy --fs-uuid --set <snipped>
linux /boot/memtest86+.bin
}

to see if it works or not?

You see, it will take quite a bit of work to do that, and a single
mistake could bork grub2 in the process. Plus, how do you keep it updated?

While I very much respect your advise & opinions, I seriously doubt that
modifying grub2 is easier than the former menu.lst and/or 'not much of a
hassle'. Note that Tom H had to provide a method simply to eliminate the
Win7 bits (thanks Tom H!) for the Win7 recovery entries.





--
ubuntu-users mailing list
ubuntu-users@xxxxxxxxxxxxxxxx
Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-users