Falling back to unity-2D after an update

Question

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?

Possibly related to a recent update - http://askubuntu.com/questions/262320/after-ubuntu-12-04-lts-update-only-unity-2d-bug?rq=1 — Heather M, Apr 16 '13 at 22:03
@Heather: Thank you! The question you've posted contained a link to the solution — Chris, Apr 17 '13 at 14:34

score 0 · Accepted Answer · answered Apr 17 '13 at 14:33

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.

Falling back to unity-2D after an update

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