After removing AMD/ATI Catalyst radeon driver, experimental trials for fixing problems드라이버의 문제해결을 위한 혹시나 하는 재설정

# apt-get update

# apt-get install --reinstall libgl1-mesa-glx libgl1-mesa-dri <--- libGL.so + mesa3d DRI drivers

# apt-get install --reinstall xserver-xorg-core <--- libglx.so of xserver


# apt-get build-dep libdrm                 <--- Userspace interface to kernel DRM services (development files, radeon-specific, etc.)

# apt-get build-dep mesa                   <--- A free implementation of the OpenGL API (DRI modules, GLX runtime, GLX development files, etc.)

# apt-get build-dep xserver-xorg-video-ati <--- X.Org X server -- AMD/ATI display driver

# apt-get build-dep xorg-server            <--- Xorg X server (core server, development files, etc.)

Reference

http://www.x.org/wiki/radeonBuildHowTo#Removing_AMD.2BAC8-ATI_catalyst.2BAC8-fglrx_driver_.28closed_source.29