[all variants] grub 2 dual boot two linux OS

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http://ubuntuforums.org – This is probably a dumb question or an easy one. But, hopefully, someone who has utilized a dual-boot setup will know but I need help understanding. :-( So, please be patient and I hope my description make some sense. Please correct me and explain if something I state can be clarified easier. I have Ubuntu installed and it boots up fine. I have other partitions and on one, I want to install Debian sid. As this will be an experimental OS, there's a possiblity for problems and I read that when you install binary drivers, you can hose your system - this includes dist-upgrade (upgrading (Hardware)