Hi,
when I do a clean install of 16.04 my Logitech Unifying keyboard works great, but after doing a dist-upgrade I can no longer move the pointer or type.
I can still see my Unifying device with the lsusb command but it seems to no longer receive signals from the keyboard - or maybe more correct; Ubuntu does no longer accept Unifying as a controlling device.
Edit: seems it is more of a general USB problem - tried to connect a corded keyboard and it doesn’t work either.