After I updated my 12.04.3 installation yesterday normal Unity didnt show up. It keeps falling back to Unity2D.

Also /usr/lib/nux/unity_support_test -p says my graphic card AMD Radeon HD 6700 Series is not supported but is used to work for over a year. It maybe that some recent changes to unity package broke something.

Update history: http://paste.ubuntu.com/6727763/

I have tried doing this:

sudo apt-get install --reinstall xserver-xorg-video-intel libgl1-mesa-glx libgl-mesa-dri xserver-xorg-core
sudo dpkg-reconfigure xserver-xorg

But now LightDM ist even starting. How to repair it to usable state?

  • Have you tried installing some drivers for your graphics card?
    – Seth
    Jan 10, 2014 at 17:41
  • I have the newest AMD drivers installed before it happen.
    – Fih
    Jan 10, 2014 at 17:52
  • Well make sure it is still installed. Somehow I doubt it will be.
    – Seth
    Jan 10, 2014 at 17:54
  • thanks Tim! removing with force option worked! I followed this: askubuntu.com/questions/160605/… is it safe install AMD drivers again? (I play games on that machine so I need fancy graphic.. [yes! native games! thx Valve])
    – Fih
    Jan 10, 2014 at 18:03

1 Answer 1


Solution was easy: This will remove proprietary driver and install Open Source one.

sudo sh /usr/share/ati/fglrx-uninstall.sh
sudo apt-get remove --purge fglrx fglrx_* fglrx-amdcccle* fglrx-dev*

Remove your xorg.conf file

sudo rm /etc/X11/xorg.conf

Re-install xorg

sudo apt-get install --reinstall libgl1-mesa-glx:i386 libgl1-mesa-glx:amd64 libgl1-mesa-dri:i386 libgl1-mesa-dri:amd64 xserver-xorg-core

Configure xorg

sudo dpkg-reconfigure xserver-xorg


sudo reboot

Now you can install proprietary driver again. Cheers!

  • This will switch from proprietary drivers to open source ones, maybe it would be useful to comment it. Moreover (I have a similar configuration) I had to add radeon.dpm=1 to kernel boot parameters to avoid serious overheating, see askubuntu.com/a/390050/16395
    – Rmano
    Jan 10, 2014 at 19:05
  • Interesting because I'm using this stack for over 1 year and half with 12.04 and I haven't seen abnormally high temperature.
    – Fih
    Feb 10, 2014 at 0:18

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