Hey guys,
So I wanted to dual boot my laptop with Ubuntu. I created a 50GB partition for Windows 8 (which I've already got installed), a 350GB one for Data to be shared between the 2 OSs, and I left 40GB or so for ubuntu.
I've tried creating the partition upon installation (using an image on my USB) but it says that those 40GB are unusable. What can I do?
SS attached
Thanks

http://postimage.org/image/4hk7cfbyb/full/