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

Bug #1726742 reported by indium
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
Ubuntu GNOME
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Bug Description

Ubuntu 17.10 Gnome session:

I cannot run 'sudo synaptic' because the 'su-owned' graphical windows seem to be not allowed on my 'non-su' gnome-session:

[@ll:~]$ sudo synaptic
[sudo] password for indium:
Invalid MIT-MAGIC-COOKIE-1 keyUnable to init server: Could not connect: Connection refused

(synaptic:9673): Gtk-WARNING **: cannot open display: :0
[@ll:~]$

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