So far all the discussions that I have found surrounding booting a Pi from Pi Desktop SSD involve Raspian only. I've just gotten my Pi Desktop case and booting from SD Card and waiting on my mSATA SSD to arrive. I'll start with Raspian on it just because all the docs cover that in detail. I'm just wondering if Ubuntu will work too? I see numerous references online to booting Mate from USB on Pi. I'm also curious about power switch safe shutdown and RTC support as well with this hardware and Ubuntu.