Hello all...first time poster and linux user. I have 3 hard drives in my computer. First one is strictly Windows 7. The other 2 I am trying to put a Distro on each and triple boot. My flavors of choice are Ubuntu 9.10 and Mandriva 10.0. I know that I should install Ubuntu last to let it's Grub2 do its thing and hopefully pick up Mandriva and allow me to boot all 3. I have read numerous guides I have found to no avail. I install Mandriva first using the use entire drive option. Now when it comes to the bootloader install I have several choices. I can either install it to MBR (which I don't want, as I will let Ubuntu install on the MBR), to install it on Mandriva's / partition, or skip bootloader. I chose to install it to Mandriva's / partiton then proceeded to install Ubuntu 9.10. After installing Ubuntu, the prober did find Mandriva but when i choose to load Mandriva it does not load stating cannot find partition. I am really lost as to how to fix this. Any help would be greatly appreciated.

You may want to try this.
Boot into Ubuntu, and run 'sudo grub-update'
IIRC, it should pick up on other OSs and update the listings automatically.
Then, if it's worked, it should allow you to boot into Mandriva.

thank you for your reply. I have ran sudo update-grub and it did find all three OS. I have a feeling it has something to do with configuring grub.

I am wondering if I am correct in telling Mandriva to install bootloader into it's / partition or shall I just tell it not to install one alltogether.