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[ubuntu] lxc Xserver fails /dev/dri/card0: failed to set DRM

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I am trying to have a container (lxc) with its own desktop on vt8 (v.s. vt7 default ubuntu desktop)

Host: ubuntu 15.04
guest: arch

My ultimate goal is to have gnome 3.16 running in a container (vt8) side by side with ubuntu (vt7).

As I start X on vt2
Quote:

/usr/bin/X vt8
I get a blank screen. (I cannot go back to the host at vt7 or any of the terminal vt1-6). At the bottom of /var/log/Xorg.0.log

I get the following error message.
Code:

[ 65103.291] (II) config/udev: Adding drm device (/dev/dri/card0)
[ 65103.291] (II) xfree86: Adding drm device (/dev/dri/card0)
[ 65103.291] (EE) /dev/dri/card0: failed to set DRM interface version 1.4: Permission denied
[ 65103.294] (EE) FBDEV(0): FBIOBLANK: Invalid argument

I would appreciate any idea how to fix this.

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