patrick@ThinkPad:~$ phablet-config writable-image
error: closed
error: closed
Traceback (most recent call last):
  File "/usr/bin/phablet-config", line 420, in <module>
    main()
  File "/usr/bin/phablet-config", line 417, in main
    args.func(adb, args)
  File "/usr/bin/phablet-config", line 143, in _handle_writable_image
    if not is_remote_root(adb):
  File "/usr/bin/phablet-config", line 107, in is_remote_root
    return adb.shell("id -ru").strip() == "0"
  File "/usr/lib/python2.7/dist-packages/phabletutils/device.py", line 144, in shell
    output = check_output(self._cmd % cmd)
  File "/usr/lib/python2.7/dist-packages/phabletutils/device.py", line 30, in check_output
    return subprocess.check_output(args, shell=True)
  File "/usr/lib/python2.7/subprocess.py", line 573, in check_output
    raise CalledProcessError(retcode, cmd, output=output)
subprocess.CalledProcessError: Command 'adb shell id -ru' returned non-zero exit status 255
patrick@ThinkPad:~$ adb devices
List of devices attached 
JU023708	device