I have installed Solaris on my x86 machine (taking 100gb of 500gb). Now I have installed Ubuntu on the system (in another 100gb).

I want to make primary OS as Solaris. I know setting have to be done in `/boot/grub/menu.lst`, but what is the actual command to be updated? When I restart the system after updating the menu file it shows only Solaris menu and no Ubuntu options.