error: No root file system is defined

[liberty821]

Installing Ubuntu 9.04 on a brand new 250GB laptop drive, and there's a problem with the partitioning.

I made three partitions: 75G, 75G, 100G (all fat32)

when I click 'forward' it says:
"No root file system is defined
Please correct this from the partitioning menu"

a bit puzzling since I chose fat32 for the file system...

How do I move on to format the partitions?

Appreciate your help, thanks.

[SlugSlug]

I would change all your partitions
first one
2GB swap
then
/ 10GB ext4
the the rest on
/home ext4

[liberty821]

But I plan on installing windows on here too... can I still do fat32 partition?

[liberty821]

So I did
2GB swap
20GB / ext4
120GB /home ext4
rest on /windows fat32

works now, thanks