When I reach the partitioning stage of the installer, when I select 'Create Custom Layout', I hit next and it takes it takes me to the next stage, where it hasn't detected my partitions correctly:

I also tried selecting 'Shrink Current System' and I get an error telling me there are no partitions to resize:

I have never had any problems before with Linux installers not being able to detect my partitions before. I'm trying to install the x64 version, and have attempted it with both DVD and USB. For reference, I have Ubuntu and Windows 7 currently installed.
Many thanks in advance if anyone can help.






