cuda10.2安装链接
https://developer.nvidia.com/cuda-10.2-download-archive?target_os=Linux&target_arch=x86_64&target_distro=Ubuntu&target_version=1604&target_type=runfilelocal
wget http://developer.download.nvidia.com/compute/cuda/10.2/Prod/local_installers/cuda_10.2.89_440.33.01_linux.run
chmod +x cuda_10.2.89_440.33.01_linux.run
sudo ./cuda_10.2.89_440.33.01_linux.run
sudo sh cuda_10.2.89_440.33.01_linux.run
卸载cuda8
sudo /usr/local/cuda-8.0/bin/uninstall_cuda_8.0.pl
sudo rm -rf /usr/local/cuda-8.0
通过vim或者gedit修改，对应命令分别为vim ~/.bashrc和gedit ~/.bashrc，将下面的内容添加到文件最后，再通过source ~/.bashrc更新环境变量。
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/cuda/lib64
export PATH=$PATH:/usr/local/cuda/bin
export CUDA_HOME=$CUDA_HOME:/usr/local/cuda
nvcc -V
