I'm installing Debian 10 but I cannot startx nor have a GUI. I think the problem is about some driver.

Here are the errors I've got in /var/log/Xorg.0.log :

  1. [drm] Failed to open DRM device for pci:0000:01:00.0 - 19
  2. open /dev/dri/card0: No such file or directory
  3. Unable to find a valid framebuffer device
  4. Screen 0 deleted because of no matching config section
  5. Cannot run in framebuffer mode. Please specify busIDs for all framebuffer devices.

If someone can help I will be extremely thankful.

  • 1
    It would be helpful if you provide what graphics card do you have and what login manager or desktop environment did you install.
    – BlueManCZ
    Apr 12, 2020 at 21:29

1 Answer 1


stumbled accross the same issue. Turned out to be the non-free firmware missing (signalled in dmesg). after installing that lot it worked.

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