Public bug reported:

With the today packages upgrade, switching from X11 to wayland, synaptic
refuse to load/open:

from the icon into the dash-to-dock, nothing happen
from the terminal:

sudo synaptic
[sudo] password for oem:
Invalid MIT-MAGIC-COOKIE-1 keyUnable to init server: Could not connect: 
Connection refused

(synaptic:2154): Gtk-WARNING **: cannot open display: :0

Previous days already have switching some packages to wayland, but
synaptic was still working. Its only with the today upgrades, after a
cold reboot, that synaptic gui is broken.

Today possibly sources problem:

Unpacking console-setup-linux (1.142ubuntu7) over (1.142ubuntu5) ...

Unpacking console-setup (1.142ubuntu7) over (1.142ubuntu5) ...

Unpacking keyboard-configuration (1.142ubuntu7) over (1.142ubuntu5) ...

Unpacking gnome-session-bin (3.24.1-0ubuntu22) over (3.24.1-0ubuntu21)
...

Unpacking gdm3 (3.25.90.1-0ubuntu2) over (3.25.90.1-0ubuntu1) ...

Unpacking libgdm1 (3.25.90.1-0ubuntu2) over (3.25.90.1-0ubuntu1) ...

Unpacking gir1.2-gdm-1.0 (3.25.90.1-0ubuntu2) over (3.25.90.1-0ubuntu1)
...

Unpacking ubuntu-session (3.24.1-0ubuntu22) over (3.24.1-0ubuntu21) ...

Unpacking gnome-session (3.24.1-0ubuntu22) over (3.24.1-0ubuntu21) ...
...
Unpacking gnome-session-common (3.24.1-0ubuntu22) over (3.24.1-0ubuntu21) ...
Setting up keyboard-configuration (1.142ubuntu7) ...

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: synaptic 0.84.2
ProcVersionSignature: Ubuntu 4.12.0-12.13-generic 4.12.8
Uname: Linux 4.12.0-12-generic x86_64
ApportVersion: 2.20.6-0ubuntu6
Architecture: amd64
CurrentDesktop: GNOME
Date: Mon Aug 21 16:21:47 2017
EcryptfsInUse: Yes
SourcePackage: synaptic
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: synaptic (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug artful wayland-session

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https://bugs.launchpad.net/bugs/1712089

Title:
  Invalid MIT-MAGIC-COOKIE-1 keyUnable to init server: Could not
  connect: Connection refused

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