Thanks @dino99 for the workaround. I get some errors about gtk widget,
but nautilus opens.

**************** Commands and errors ***********

$ xhost +si:localuser:root
localuser:root being added to access control list

$ pkexec nautilus
sys:1: PyGIWarning: Nautilus was imported without specifying a version first. 
Use gi.require_version('Nautilus', '3.0') before import to ensure that the 
right version gets loaded.
Gtk-Message: GtkDialog mapped without a transient parent. This is discouraged.

(nautilus:2687): Gtk-CRITICAL **: gtk_widget_show: assertion
'GTK_IS_WIDGET (widget)' failed

** (nautilus:2687): CRITICAL **: setup_side_pane_width: assertion
'priv->sidebar != NULL' failed

** (nautilus:2687): WARNING **: Unable to get contents of the bookmarks
file: Error opening file /root/.gtk-bookmarks: No such file or directory

** (nautilus:2687): WARNING **: Unable to get contents of the bookmarks
file: Error opening file /root/.gtk-bookmarks: No such file or directory

************* End commands and errors ***********

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to policykit-1 in Ubuntu.
https://bugs.launchpad.net/bugs/1710918

Title:
  pkexc nautilus error

Status in policykit-1 package in Ubuntu:
  Invalid

Bug description:
  I have installed Nautilus-Admin to enable opening nautilus and gedit
  as administrator. But it does not work. On the terminal I get the
  following error:

  $ pkexec nautilus
  No protocol specified
  Unable to init server: Could not connect: Connection refused

  (nautilus:2524): Gtk-WARNING **: cannot open display: :0

  Thanks

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: policykit-1 0.105-18
  ProcVersionSignature: Ubuntu 4.11.0-13.19-generic 4.11.12
  Uname: Linux 4.11.0-13-generic x86_64
  ApportVersion: 2.20.6-0ubuntu5
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Tue Aug 15 12:09:19 2017
  InstallationDate: Installed on 2017-08-09 (5 days ago)
  InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Alpha amd64 (20170807)
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: policykit-1
  UpgradeStatus: No upgrade log present (probably fresh install)

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