Same happened to me. I was testing this iso: http://cdimage.ubuntu.com/daily-live/20120809.1/quantal-desktop-i386.iso on a virtualbox virtual machine with windows 7 already installed.
When I moved the slider bar that separates the grey sections of the hard drive on witch to install ubuntu and clicked installed now ubiquity crashed.
Same happened to me. I was testing this iso: http:// cdimage. ubuntu. com/daily- live/20120809. 1/quantal- desktop- i386.iso on a virtualbox virtual machine with windows 7 already installed.
When I moved the slider bar that separates the grey sections of the hard drive on witch to install ubuntu and clicked installed now ubiquity crashed.