Unable to connect to Arduino 101

I am unable to connect to my Arduino 101 even though the device info can be read:
BN: Arduino/Genuino 101
VID: 8087
SN: AE6642SQ54702D1

Running Linux (Ubuntu 16.04).

I've tried everything that I can think of, even purchasing a second Arduino 101 (hoping the problem was dead hardware somewhere on the board).

Please help.

Have you installed the boards package for the 101 ?