What partition to use

[Adam Tong]

Hi,

I had some problems with Fedora and I want to try Ubuntu.
I have laptop with win7 and fedora 15.

Here is the list of partitions as displayed by Ubuntu installation program:
sda1 (ntfs)    1.6 GB
sda2 (ntfs)    214.1 GB
sda3 (ext4)    524.3 MB
sda5 (unknown) 283.9 GB

I choosed sda5 but had an error message saying: no root filesystem defined.
I checked the change button, had several options, but do not what to choose exactly.

Can you help with this?