> B/c Ubuntu does not, by default, install bootloader
> in the installed partition, it is not easy to
> chainload Ubuntu from OpenSolaris. Thus, you did a
> correct thing by installing OpenSolaris first.
>
> However, at the present time, Ubuntu's os-prober only
> probes Hurd, Linux, Windows, and xBSD, OpenSolaris
> insallation is not yet automatically probed (we hope
> this situation will be changed, considering that an
> increasing number of Ubuntu users are very interested
> in OpenSolaris). You have to do the chainloading
> manually. This is very easily done in Ubuntu 9.04
> and previous versions; you simply need to edit the
> menu.lst file.
>
> In Ubuntu 9.10, which uses GRUB2, the procedure is
> quite different. You can't manually edit the
> /etc/default/grub.cfg file. However, it is still
> quite easy to dual boot Opensolaris 2009.06 and
> Ubuntu 9.10. The steps are briefly listed below:
>
> 1. Copy the attached "40-custom" file into
> /etc/grub.d , or by adding the following lines at thd
> end of your existing 40-custom file;
>
> menuentry "OpenSolaris" {
> set root=(hd0,1)
> chainloader +1
> }
>
>
> 2. Run the update-grub command as root (this will
> generate a new grub.cfg file allowing you to boot
> into OpenSolaris;
>
> 3. Re-start your machine, selecting OpenSolaris as
> your boot option.
All the commands must be executed as root. To switch to the root user, you can
enter the following command in Ubuntu:
sudo su
enter your own (user) password, then repeat the steps described above. (Or you
can start every command with "sudo".)
Oops, /etc/default/grub.cfg should be /boot/grub/grub.cfg. This file can be
edited only by executing the update-grub command (again, as root--everything
involving GRUB need be done as root, or with root privilege).
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