[ubuntu] Chainloading Ubuntu from Grub Legacy

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http://ubuntuforums.org – I am trying to boot ubuntu as an alternative OS running from an external hard drive. My main boot loader on /dev/sda is grub legacy. I have Gentoo running on sda and sdb and Ubuntu on sdc. So I figured I can simply configure a chainloader on grub-lagacy to boot either into Gentoo or Ubuntu. Gentoo works well enough, however Ubuntu does not work via this method. A little bit of research brought me to this page : http://ubuntu-install.blogspot.com.a...-to-grub2.html which suggest to use the core.img file instead. However my ubuntu installation does not contain this file ? Here is what I got (Hardware)