m3800 trackpad stopped working in 16.04

I upgraded from a perfectly-workint 15.10 (other than sleep mode) to 16.04 yesterday and now my trackpad is only detected as a mouse. Two finger scrolling no longer works, blocking touch events while typing is broken.

And while tap-to-click works, I can only press-click the trackpad along the bottom left/right corners to perform actual left/right clicks for highlighting, dragging, etc..

Barton mentioned that 16.04 would be supported, so I'm curious if anyone's up to speed yet on what might have broken here.

As a side note the bluetooth pairing/connected problem I had with my Jaybird X2 headset that I reported several months ago when installing 15.10 (and was working fine) is back, and the instructions I followed to get them working in 15.10 no longer work in 16.04.