X11 authentication problem

snapd
1

Hi there, this is a follow-up to

I cannot start GUI snap applications remotely. One writes:

Unable to init server: Could not connect: Connection refused
Fatal error: exception Gtk.Error("GtkMain.init: initialization failed\nml_gtk_init: initialization failed")

another says:

X11 connection rejected because of wrong authentication.

The above linked snapcraft forum article suggests to set XAUTHORITY and linking $HOME/.Xauthority from /snap/myapp/current, but neither helped.

What should I do to make it work?

2

What are you doing to stop it working? This works for me:

ssh -X octopull-x1c3-22-10 "sh -lc 'XAUTHORITY=~/.Xauthority ubuntu-frame'"
3

I ssh -X into the remote machine and there I start

$ /snap/bin/myapp

apt-installed X apps do work remotely.

What is “ubuntu-frame” in the above command?

4

Now I see. It is the GUI application. I tried it with my one and told me te first error message above again.

5

ubuntu-frame is a snap that I happen to have installed.

It looks like you are not setting XAUTHORITY to “~/.Xauthority” when launching the snap.

6

I have put an

export XAUTHORITY=/home/user/.Xauthority

line into my .bashrc, ran it. Now starting

/snap/bin/myapp

resulted in a longer wait than usual, but got the same error message as before:

Unable to init server: Could not connect: Connection refused
Fatal error: exception Gtk.Error("GtkMain.init: initialization failed\nml_gtk_init: initialization failed")

For non-snap applications my .Xauthority file works. Should I re-generate it somehow?

7

Interestingly, gimp did start now, but not myapp.

8

Try my snap. If that works, then the problem is your snap.

9

OK, so other snaps work and yours doesn’t. You’ll have to work out what is different

10

This seems to be something GTK-specific, or how my application was packaged in snap. I go with my investigations in that direction.

11

GTK apps (e.g. Gimp) don’t have a problem running on X11: I suggest you investigate your packaging first