Comment 5 for bug 727842

I'd almost bet that Evan Dandrea provided the answer to this in bug 652852 comment #30:

"This is back in Natty, but the UI isn't complete."

Perhaps this deserves a mention in the Natty Alpha 3 release notes?

If so I should clarify that this only occurs if unallocated space is available and the "install alongside other operating systems" option is selected. If the install process is being run after selecting the "Install Ubuntu" option from the boot menu clicking on "install alongside" results in an infinitely "spinning wheel". If the install process is started from the live desktop clicking on "install alongside" results in the apport crash report I used to report this.