Public bug reported:

Description:    Ubuntu 16.04.3 LTS
Release:        16.04

When i try to run some script via udev rules.
For example:
SUBSYSTEM=="input", KERNEL=="mouse[0-9]*", ACTION=="add", ENV{DISPLAY}=":0", 
RUN+="sudo /usr/local/bin/touchpad-add"

there is one line in the script "touchpad-add"
/usr/bin/xinput enable 12 >>/tmp/tpbe.log 2>&1
12 is ID of my touchpad

I get next error message
Invalid MIT-MAGIC-COOKIE-1 keyUnable to connect to X server

when i try to run this script from terminal it work is ok.

I try to get Xauthority from script
/run/user/1000/gdm/Xauthority

the comand out "xauth list" from root and other users - the same
xauth list
ash/unix:  MIT-MAGIC-COOKIE-1  2fd711d467a17da9bafb6a4a0dfc52db
#ffff#617368#:  MIT-MAGIC-COOKIE-1  2fd711d467a17da9bafb6a4a0dfc52db

In the previous versions of ubuntu this script worked properly.

** Affects: ubuntu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1716832

Title:
  Unable to connect to X server via non termal run

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