the VL install should catch your other OSes, but during install, have VL's lilo avoid taking the MBR - select "skip," and it still will spot your other OSes, leaving the existing boot loader in place. As M0E mentions, if you want
to use Ubu's grub, you will likely have to manually alter its grub --- Ubu doesn't always play nice. (And Windows is meanest ;-) So far, the latest VL versions I used, always notice the other OSes, regardless if they are using grub or lilo or Win. Consider altering the Win loader --- it's really easy. (see below)
Generally, here's what I've found to be the safest way (on a new machine):
1. Figure out how many OSes you'll have
2. use partedmagic live to divide up partitions for the OSes
3. *always* install Win before any others (as it will NUKE everyone else)
4. Do the grub loader versions, leave Win on the MBR, then
5. Do the lilo versions, again leave Win on the MBR, and save the best for last:
Then use Granny Geeks' technique for setting up the Win loader to spot the other OSes. And if your like me, and head off to the wrong one by mistake, you can have those loaders refer *back* to the others!
BTW, welcome to the forum! ... you will likely discover that VL is *much* faster than Ubu!
(And, no, I don't work here, or sell VL advertising
- Howard in Florida