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I have just done a clean install of 17.10 I am finding that synaptic package manager won't work: 

synaptic-pkexec
No protocol specified
Unable to init server: Could not connect: Connection refused

(synaptic:9019): Gtk-WARNING **: cannot open display: :0

Also finding that after installing Shotcut from Snap I get the following error: 'This program requires SDL2' I wonder if it's related? Any help would be very welcome.

Thanks!

Steve Brodie
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1 Answers1

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At your login screen, click the little cog wheel icon, and switch to gnome on xorg, and Synaptic (and some other apps) will now launch without difficulty. It's a Wayland problem.

heynnema
  • 70,711