$ snap install --dangerous cwr_0.1_amd64.snap
error: cannot communicate with server: Post http://localhost/v2/snaps: dial unix /run/snapd.socket: connect: connection refused

$ systemctl status snapd.service
● snapd.service - Snappy daemon
   Loaded: loaded (/lib/systemd/system/snapd.service; enabled; vendor preset: enabled)
   Active: inactive (dead) (Result: exit-code) since Tue 2017-01-24 09:02:11 PST; 1h 23min ago
  Process: 18960 ExecStart=/usr/lib/snapd/snapd (code=exited, status=1/FAILURE)
 Main PID: 18960 (code=exited, status=1/FAILURE)

Jan 24 09:02:11 me-vm systemd[1]: snapd.service: Unit entered failed state.
Jan 24 09:02:11 me-vm systemd[1]: snapd.service: Failed with result 'exit-code'.
Jan 24 09:02:11 me-vm systemd[1]: snapd.service: Service hold-off time over, scheduling restart.
Jan 24 09:02:11 me-vm systemd[1]: Stopped Snappy daemon.
Jan 24 09:02:11 me-vm systemd[1]: snapd.service: Start request repeated too quickly.
Jan 24 09:02:11 me-vm systemd[1]: Failed to start Snappy daemon.