Here the steps I used to install Ubuntu.

1. Booted Ubuntu 13.04 from a USB drive (I have XP). Everything going fine. Gave me options how to install.
2. Chose "Other" as I have multiple drives. Gave me the option which drive to use.
3. Screen came up with all my drives and the partitions on each. (PS It would be REALLY useful if drive letters were included in the list!)
4. Highlighted the drive/partition I wanted to use: `/dev/sdc2`
5. Screen showed "Device for boot loader installation: `/dev/sdc2` (So far, so good - I think)
6. Clicked on "Install Now" and get the message "No root file system is defined. Please correct this from the partitioning menu". BUT, doesn't tell me where the partitioning menu is! I double clicked on the drive/partition I want to use, and a small "Edit Partition" window opens. I assume this IS the partitioning menu.
7. Allows me to change the size of the partition (it should already be big enough).
"Use as" I had set up as NTFS (There were 10 choices to pick from. From some of the comments on here it sounds like I should be using `ext4`. Is that right?
Next line is a checkbox with "Format the partition". Didn't do that. It's a new partition.
8. Next line "Mount Point" I put `/dos`. Again from other comments on here it looks like I should be using `/` - right?

If I change the above to `ext4` and `/` will it continue to install? Don't know what else to expect after this?