Comment 39 for bug 1713313

Raised https://bugs.launchpad.net/ubuntu/+source/x11-xserver-utils/+bug/1724748 which I think is actually a dup of this existing bug. Here's what I'm seeing:

All (most?) gui apps fail to launch when using sudo, out-of-box, desktop 17.10 install. For example, gparted and virt-manager, which both require sudo, are not usable without a work-around.

#### Out-of-box experience
rbeisner@vistula:~⟫ sudo gedit
No protocol specified
Unable to init server: Could not connect: Connection refused

(gedit:32146): Gtk-WARNING **: cannot open display: :0

rbeisner@vistula:~⟫ xhost
access control enabled, only authorized clients can connect
SI:localuser:rbeisner

#### Work-around:

rbeisner@vistula:~⟫ xhost si:localuser:root
localuser:root being added to access control list

rbeisner@vistula:~⟫ xhost
access control enabled, only authorized clients can connect
SI:localuser:root
SI:localuser:rbeisner

rbeisner@vistula:~⟫ sudo gedit
rbeisner@vistula:~⟫ # (it launches ok)