(RaspberryPi2)ubuntu@localhost:~$ sudo snappy install docker
docker      8 MB     [=====================================================================================================]    OK    
ERROR: Could not generate AppArmor profile for 'docker_docker_1.5.0.002.json'. Skipping
Traceback (most recent call last):
  File "/usr/lib/snappy-systemd/systemd-snappyhook", line 198, in <module>
    update_systemd_units()
  File "/usr/lib/snappy-systemd/systemd-snappyhook", line 186, in update_systemd_units
    install(f)
  File "/usr/lib/snappy-systemd/systemd-snappyhook", line 62, in install
    update_content(f)
  File "/usr/lib/snappy-systemd/systemd-snappyhook", line 153, in update_content
    content = generate_systemd_unit(app_triple, pkg_path, fp)
  File "/usr/lib/snappy-systemd/systemd-snappyhook", line 86, in generate_systemd_unit
    if not is_allowed(v):
  File "/usr/lib/snappy-systemd/systemd-snappyhook", line 69, in is_allowed
    if re.match(WHITELIST, s):
  File "/usr/lib/python3.4/re.py", line 160, in match
    return _compile(pattern, flags).match(string)
TypeError: expected string or buffer
Traceback (most recent call last):
  File "/usr/bin/click", line 86, in <module>
    sys.exit(main())
  File "/usr/bin/click", line 82, in main
    return mod.run(args)
  File "/usr/lib/python3/dist-packages/click/commands/install.py", line 110, in run
    quiet=not options.verbose)
  File "/usr/lib/python3/dist-packages/click/install.py", line 482, in install
    path, user=user, all_users=all_users, quiet=quiet)
  File "/usr/lib/python3/dist-packages/click/install.py", line 466, in _unpack
    user_name=None)
GLib.Error: click_hooks_error-quark: Hook command '/usr/lib/snappy-systemd/systemd-snappyhook' failed: Child process exited with code 1 (6)