How to fix error Xlib.error.DisplayConnectionError: Can't connect to display ":0": b'No protocol specified\n'

Question

I'm making some program with python3 and XLib.

On my PC with Ubuntu 14.04 everything works fine but when I try to run my app in my notebook with manualy installed Xorg I get exception:

Xlib.error.DisplayConnectionError: Can't connect to display ":0": b'No protocol specified\n'

on line:

self.__display = Xlib.display.Display()

What's going on here? How to fix this that it could work on every Linux?

Edit:

This does not look like duplicate of X11: run a gnome app as another user. On my both computers I have same users and groups, so this problem is probably not connected with lack of permissions to run my program.

It must be something else something with bad configuration of X.

Ebonieebonite

possible duplicate of X11: run a gnome app as another user – Anetteaneurin

Answer 1

Ok, It was bug in python3-xlib. See https://github.com/LiuLang/python3-xlib/issues/6 for details.

Ebonieebonite

link is broken. – Welldressed

Page if broken, but since it was from 2015, thats ok – Leyba

Answer 2

Temporary workaround is

$ xhost +

http://ubuntuforums.org/showthread.php?t=2290602

Tarnetgaronne

Answer 3

this problem is related to x display server connection policies, by default really restrictive

you can solve this issue by allowing access to the user that is going to be executing that code

if you're the user that is going to execute plover then the code to be pasted in a shell is

xhost +local:$USER

otherwise you can switch out $USER with the username of the user that's going to run the code.

a way to make this change permanent is adding that line of code to your login script, id est ~/.profile for your user, or for any user at file /etc/profile/ in case you want to suppress command output text you can redirect output to /dev/null, making the whole command:

xhost +local:$USER > /dev/null

had faced this same issue while trying to run plover.

Kathyrnkati

Answer 4

The permanent proper solution is to add the allowed hosts and users to /etc/Xn.hosts where n stands for the display number (e.g. /etc/X0.hosts). The following content will allow all users for localhost (without trailing whitespaces):

local:

Oui

Answer 5

It definitely has something to do with the permissions. To get super user permissions, on Linux you can simply type:

$ sudo su
<input your root password>

Now run the python file again

Hope this helped!

Cranford