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I wanted to install gcc 4.8 from 4.7.3 with this following commands:

sudo add-apt-repository ppa:ubuntu-toolchain-r/test -y
sudo apt-get update
sudo apt-get install gcc-4.8-base

after that gcc was installed but when I do gcc --version still have 4.7.3 then I was trying this commands (don't know if in this order):

sudo apt-get clean
sudo apt-get -f install
sudo apt-get update 
sudo apt-get upgrade -f 

after that my OpenGL version decreased from 3.0 to 2.1. When doing glxinfo | grep OpenGL I get:

OpenGL vendor string: X.Org
OpenGL renderer string: Gallium 0.4 on AMD RV770
OpenGL version string: 2.1 Mesa 9.1
OpenGL shading language version string: 1.30
OpenGL extensions:

I tried to install again mesa 9.1 from source but this didn't work. What happens here? Please help.

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1 Answer 1

Solved by reinstalling the system

OpenGL vendor string: X.Org
OpenGL renderer string: Gallium 0.4 on AMD RV770
OpenGL version string: 3.0 Mesa 9.1.1
OpenGL shading language version string: 1.30
OpenGL extensions:
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