Error libGL.so: cannot open shared object file using Android emulator
This works for me on Ubuntu 14.04 64-bit:
$ sudo apt-get install libgl1-mesa-dri
$ sudo ln -sv /usr/lib/x86_64-linux-gnu/mesa/libGL.so.1 /usr/lib/x86_64-linux-gnu/libGL.so
As I'm using 64-bit Ubuntu 12.04. So, I did this
$ sudo apt-get install git-core gnupg flex bison gperf build-essential \
zip curl libc6-dev libncurses5-dev:i386 x11proto-core-dev \
libx11-dev:i386 libreadline6-dev:i386 libgl1-mesa-glx:i386 \
libgl1-mesa-dev g++-multilib mingw32 openjdk-6-jdk tofrodos \
python-markdown libxml2-utils xsltproc zlib1g-dev:i386
$ sudo ln -s /usr/lib/i386-linux-gnu/mesa/libGL.so.1 /usr/lib/i386-linux-gnu/libGL.so
On Fedora
sudo yum install mesa-libGL-devel
http://learnedstuffs.wordpress.com/2012/07/17/fixing-ubuntu-error-failed-to-load-libgl-so/
apt-get install libgl1-mesa-dev
worked for me