Dual Boot Problem

[mischa falkenburg]

Hello All,

I had a "cobbled together" box that has been running Xubuntu 8.04.1 just 
fine.
The hard drive is large enough that I tried to install UbuStu 10.04 
.iso...install went "flawlessly", meaning that 10.04 detected the 8.04 
system and that there should be no problem with the MBR.
Upon reboot Grub initializes but goes directly to the 8.04 instead of 
showing my a choice between the two.
Is there some file I need to modify, or what?

Thanks-in-advance,

Mischa