I followed the guide and my system has been up and running for many days now. Many thanks to people on this forum. I even upgraded the system from a lowly E5200 to a Q9550. I guess I want to do more.

(a) Add a clean Ubuntu
I installed Ubuntu and then reinstalled Chameleon. Chameleon recognizes the Linux partition. When I select the linux partition and boot, grub complains about unknown file system and then throws me into grub rescue.

This is the latest and greatest Ubuntu 9.10. Ubuntu boots after installation but does not boot after Chameleon is installed even when Chameleon can see the Linux partition.

Ubuntu is now using ext4 as default file system.

(b) Restore Ubuntu from another machine instead of installing a clean copy. I have not go this far yet. I guess I will use dd (with care).

So yeah, I am asking for trouble and probably deserve it but any advice from someone who has done a clean install or better yet, a restore from another Ubuntu install under Chameleon, will be appreciated.