Comment 8 for bug 1173527

64bit computers can run 32bit version of ubuntu. To show warnings, we need to boot. If the 32bit image managed to boot, the system in question does support legacy boot and it is active / being used. Therefore there is no reason for installation to fail. If on the other hand the cd does not boot, one would assume something is odd and we would not be able to show a warning =) Therefore this bug report is in my opinion invalid.