1，

cd /usr/local/cuda6.5/bin/ sudo ./uninstall_**** 12

2,

sudo apt-get purge --auto-remove nvidia-cuda-toolkit 1

3, delete the /opt/cuda and ~/NVIDIA_GPU_Computing_SDK

4, 打开~/.bashrc 删除

export PATH=$PATH:/opt/cuda/bin export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/opt/cuda/lib:/opt/cuda/lib64