I have ubuntu 10.10 on sda1. Archlinux with its bootloader, Grub1, on sda3. Ubuntu's bootloader grub2 in on sda. How can I create an entry for sda3 Grub1 in ubuntu's sda Grub2. Simply put, On bootup I should see Grub2 first and it should have an entry for Grub1.
You can just put
in /etc/grub.d/40_custom and then run
GRUB2 supports the chainloader command ( that instead of booting directly a kernel, simply 'pass the stick' to the next boot loader ).
So in your /boot/grub.cfg file you should add something that resemble this:
Be aware that if you update your grub2 configuration by its tool ( update-grub ) you will need to apply this setting again.