I ran into this same exact issue and thermoman's workaround worked like a charm. All i wanted to do was manually create my partition layout using systemrescuecd and fdisk, then install ubuntu on the partition i had created specifically for it. When tried to install on the selected partition the same failure described by thermoman was encountered. I then spent several hours trying all types of ridiculousness before i came across thermoman's workaround. Went back to my original partition setup, did the "swapoff thing" and the install worked fine.
I ran into this same exact issue and thermoman's workaround worked like a charm. All i wanted to do was manually create my partition layout using systemrescuecd and fdisk, then install ubuntu on the partition i had created specifically for it. When tried to install on the selected partition the same failure described by thermoman was encountered. I then spent several hours trying all types of ridiculousness before i came across thermoman's workaround. Went back to my original partition setup, did the "swapoff thing" and the install worked fine.