Tom H <tomh0665 <at> gmail.com> writes:
> On Mon, Jun 6, 2011 at 7:10 AM, Simon Pepping <spepping <at>
> leverkruid.eu> wrote:
> >
> > I have a debian and a ubuntu system in two different partitions on
> > the same
> > disk. grub-pc on the debian system provides the boot-loader.
> >
> > When I have grub-pc installed on the ubuntu system, updates of
> > that package
> > overwrite debian's grub on the MBR.
> >
> > When I uninstall grub-pc from ubuntu, update-grub on the debian
> > system is no
> > longer able to generate good lines for ubuntu in grub.cfg.
>
> If you uninstall grub-pc from Ubuntu and run "os-prober" in Debian,
> isn't the Ubuntu install detected properly?! (What does "generate
> good
> lines for ubuntu" mean?)
>
from Debian when grub is installed on Ubuntu:
>sudo linux-boot-prober /dev/sda1
/dev/sda1:/dev/sda1:Ubuntu, met Linux 2.6.38-8-generic-pae:
/boot/vmlinuz-2.6.38-8-generic-pae:/boot/initrd.img-2.6.38-8-generic-pae:
root=UUID=xxx ro quiet splash vt.handoff=7
/dev/sda1:/dev/sda1:Ubuntu, met Linux 2.6.38-8-generic-pae
(herstelmodus):
/boot/vmlinuz-2.6.38-8-generic-pae:/boot/initrd.img-2.6.38-8-generic-pae:
root=UUID=xxx ro single
grub.cfg in Debian when grub is installed on Ubuntu:
### BEGIN /etc/grub.d/30_os-prober ###
menuentry "Ubuntu, met Linux 2.6.38-8-generic-pae (on /dev/sda1)"
--class gnu-linux --class gnu --class os {
insmod part_msdos
insmod ext2
set root='(hd0,msdos1)'
search --no-floppy --fs-uuid --set=root xxx
linux /boot/vmlinuz-2.6.38-8-generic-pae root=UUID=xxx ro quiet
splash vt.handoff=7
initrd /boot/initrd.img-2.6.38-8-generic-pae
}
menuentry "Ubuntu, met Linux 2.6.38-8-generic-pae (herstelmodus)
(on /dev/sda1)" --class gnu-linux --class gnu --class os {
insmod part_msdos
insmod ext2
set root='(hd0,msdos1)'
search --no-floppy --fs-uuid --set=root xxx
linux /boot/vmlinuz-2.6.38-8-generic-pae root=UUID=xxx ro single
initrd /boot/initrd.img-2.6.38-8-generic-pae
}
### END /etc/grub.d/30_os-prober ###
from Debian when grub is not installed on Ubuntu:
>sudo linux-boot-prober /dev/sda1
/dev/sda1:/dev/sda1::/boot/vmlinuz-2.6.38-8-generic-pae:
/boot/initrd.img-2.6.38-8-generic-pae:root=/dev/sda1
grub.cfg in Debian when grub is not installed on Ubuntu:
### BEGIN /etc/grub.d/30_os-prober ###
menuentry "Ubuntu 11.04 (11.04) (on /dev/sda1)" --class gnu-linux
--class gnu --class os {
insmod part_msdos
insmod ext2
set root='(hd0,msdos1)'
search --no-floppy --fs-uuid --set=root xxx
linux /boot/vmlinuz-2.6.38-8-generic-pae root=/dev/sda1
initrd /boot/initrd.img-2.6.38-8-generic-pae
}
### END /etc/grub.d/30_os-prober ###
The latter leads to a quirky boot process in Ubuntu.
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