I use Ubuntu 17.10.

When I start gedit, virt-manager as root I get a dubious error message: gtk warning cannot open display :0.0

I read many posts but none works with Ubuntu 17.10.

Thanks for any help.

marked as duplicate by karel, Eric Carvalho, Martin Schröder, Charles Green, ravery Feb 10 at 14:16

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  • Other root applications are broken on Wayland too (see bug 1713313 and bug 1713311 ). – N0rbert Oct 22 '17 at 10:47
  • I use the new AMD Cpu with Gigabyte so i need Kernel 4.10 >. Thans i read this post and it is now clear. – Rumel66 Oct 22 '17 at 16:05

By default 17.10 does not allow root to access your display.

Try the command xhost +si:localuser:root then launch gedit with root privilege.

  • I got the same error message when i set the xhost local:root. – Rumel66 Oct 22 '17 at 11:09
  • try xhost +si:localuser:root seems thy changed the command also – ravery Oct 22 '17 at 11:12
  • This worked for me. Thanks. – Philippe Delteil Mar 13 at 14:25

There is an alternative method by typing these commands:

su -

gedit

When you will type 1st command, It will prompt for the password.

Note that by this way gedit will open as the root user.

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