UBUNTU 14.04 LTS
server glx version string: 1.4
client glx version string: 1.4
GLX version: 1.4
OpenGL core profile version string: 3.3 (Core Profile) Mesa 10.1.3
OpenGL core profile shading language version string: 3.30
OpenGL version string: 3.0 Mesa 10.1.3
OpenGL shading language version string: 1.30

UBUNTU 15.10
server glx version string: 1.4
client glx version string: 1.4
GLX version: 1.4
OpenGL version string: 2.1 Mesa 11.0.2
OpenGL shading language version string: 1.20
OpenGL ES profile version string: OpenGL ES 2.0 Mesa 11.0.2
OpenGL ES profile shading language version string: OpenGL ES GLSL ES 1.0.16