Thanks for your report. This is also bug 41865, and is fixed in current daily builds (http://cdimage.ubuntu.com/kubuntu/daily-live/current/, though at the time of writing you'll want to wait for the next daily build for another fix affecting users of multiple-disk systems).
I believe the empty radio button has also been fixed since the build you're using.
Thanks for your report. This is also bug 41865, and is fixed in current daily builds (http:// cdimage. ubuntu. com/kubuntu/ daily-live/ current/, though at the time of writing you'll want to wait for the next daily build for another fix affecting users of multiple-disk systems).
I believe the empty radio button has also been fixed since the build you're using.