** Description changed:

  Error message the virtual machine Ubuntu 17.10:
  ---------------------------
  No protocol specified
  Unable to init server: Could not connect: Connection refused
  
  (nautilus:2377): Gtk-WARNING **: cannot open display: :0
  ---------------------------
- Note that it works in Ubuntu 18.04 and in the host with Ubuntu 17.10. It only 
fails in the virtual machine and the error has been introduced recently. 3D is 
NOT enabled.
+ Note that it works in Ubuntu 18.04 and in the host with Ubuntu 17.10. It only 
fails in the virtual machine and the error has been introduced recently. 3D is 
NOT enabled. 
+ 
+ The problem is caused by Wayland! only when Wayland is the default, the
+ problem occurs. As soon as Xorg is used as default (18.04 or 'Vbox 3D
+ enabled' in 17.10), the problem disappears.
  
  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: gnome (not installed)
  ProcVersionSignature: Ubuntu 4.13.0-32.35-generic 4.13.13
  Uname: Linux 4.13.0-32-generic x86_64
  ApportVersion: 2.20.7-0ubuntu3.7
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Mon Feb 19 17:12:45 2018
  InstallationDate: Installed on 2017-09-30 (142 days ago)
  InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Alpha amd64 (20170926)
  SourcePackage: meta-gnome3
  UpgradeStatus: No upgrade log present (probably fresh install)

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https://bugs.launchpad.net/bugs/1750443

Title:
  sudo nautilus or gedit not working

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