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I have a laptop with nvidia optimus technology and I had installed bumblebee (running ubuntu 12.04 64bit).

After an update ubuntu-2d is loaded (I verified that with echo $DESKTOP_SESSION printing ubuntu-2d) even if "ubuntu" is selected at the login screen.

What can I do to restore unity-3D?

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    Possibly related to a recent update - askubuntu.com/questions/262320/…
    – Heather M
    Apr 16, 2013 at 22:03
  • @Heather: Thank you! The question you've posted contained a link to the solution
    – Chris
    Apr 17, 2013 at 14:34
  • Glad you found a solution! :)
    – Heather M
    Apr 19, 2013 at 2:06

1 Answer 1

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I found a solution after looking the question Heather posted as a comment.
Source of solution is here
These are the steps that have to be done:

sudo apt-get purge nvidia*
sudo apt-get install --reinstall xserver-xorg-video-intel  libgl1-mesa-glx libgl1-mesa-dri xserver-xorg-core
sudo dpkg-reconfigure xserver-xorg
sudo update-alternatives --remove gl_conf /usr/lib/nvidia-current/ld.so.conf

After these, I've restarted my system and unity-3D is loaded.

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