After some digging I determined this is an issue with Cubic. For some reason Cubic removes the minimal install manifest which Ubiquity relies on for the minimal install. After modifying the ISO to restore the file the install worked, and booted to a minimal install. I've logged a bug with the Cubic team.
After some digging I determined this is an issue with Cubic. For some reason Cubic removes the minimal install manifest which Ubiquity relies on for the minimal install. After modifying the ISO to restore the file the install worked, and booted to a minimal install. I've logged a bug with the Cubic team.