[Ubunut 16.04] Panels not visible

[Pinkesh]

Description: Ubuntu 16.04 LTS
Release: 16.04

I recently upgraded to Ubuntu 16.04 LTS from 14.04 LTS and found a lot of broken things.
Things were working almost fine, but today i realised that on running "cheese" i am getting the following error, "cheese: error while loading shared libraries: libgbm.so.1: cannot open shared object file: No such file or directory", so i ran the following commands,

 2883 sudo apt-get install libglu1-mesa:i386
 2884 cheese
 2885 dpkg -L libgbm1
 2886 sudo apt-get remove libglu1-mesa:i386
 2887 sudo apt-get remove libglu1-mesa
 ..
 2915 sudo apt-get install libglu1-mesa

Finally, on restarting the system, all my panels vanished. This is similar to what you get when you kill gnome-shell in ubuntu 14.04 LTS, but it seems it is no longer available in 16.04. I have attached a screenshot for clear description of problem.

http://i.imgur.com/dtm6mep.png
http://i.imgur.com/RruXCed.png

Any help?
I am not sure if this bug belongs to this package. If not, then please let me know.