ubuntu安装多个版本的CUDA并随时切换

#先执行下面的命令安装相关依赖，
#否则会出现`Missing recommended library`错误
sudo apt-get install freeglut3-dev build-essential libx11-dev libxmu-dev libxi-dev libgl1-mesa-glx libglu1-mesa libglu1-mesa-dev 


sudo sh cuda_8.0.61_375.26_linux.run #开始安装

#..一堆协议说明...
#直接按q退出协议说明.
zerozone@zerozone: accept/decline/quit: accept #接受协议

Install NVIDIA Accelerated Graphics Driver for Linux-x86_64 375.26? 
y)es/(n)o/(q)uit: n #是否显卡驱动包，由于已经安装显卡驱动，选择n

Install the CUDA 8.0 Toolkit?
(y)es/(n)o/(q)uit: y #是否安装工具包，选择y

Enter Toolkit Location
[ default is /usr/local/cuda-8.0 ]: #工具包安装地址，默认回车即可

Do you want to install a symbolic link at /usr/local/cuda?
(y)es/(n)o/(q)uit: y #添加链接**注意这个连接，如果你之前安装过另一个版本的cuda，除非你确定想要用这个新版本的cuda，否则这里就建议选no，因为指定该链接后会将cuda指向这个新的版本**

Install the CUDA 8.0 Samples?
(y)es/(n)o/(q)uit: y #安装样例

Enter CUDA Samples Location
 [ default is /root ]: #样例安装地址默认即可

# ***安装信息***
Installing the CUDA Toolkit in /usr/local/cuda-8.0 ...

Missing recommended library: libXi.so
Missing recommended library: libXmu.so
#注意，这里出现了Missing recommended library错误，
#是因为博主在第一次安装时，没有添加最开始的那条安装相关依赖的指令，
#之后我添加了依赖后，再次安装，就没有Missing错误了

Installing the CUDA Samples in /root ...
Copying samples to /root/NVIDIA_CUDA-8.0_Samples now...
Finished copying samples.

===========
= Summary =
===========
Driver:  Not Selected
Toolkit: Installed in /usr/local/cuda-8.0
Samples: Installed in /root, but missing recommended libraries

Please make sure that
 -  PATH includes /usr/local/cuda-8.0/bin
 -  LD_LIBRARY_PATH includes /usr/local/cuda-8.0/lib64, or, add /usr/local/cuda-8.0/lib64 to /etc/ld.so.conf and run ldconfig as root

To uninstall the CUDA Toolkit, run the uninstall script in /usr/local/cuda-8.0/bin

Please see CUDA_Installation_Guide_Linux.pdf in /usr/local/cuda-8.0/doc/pdf for detailed information on setting up CUDA.

***WARNING: Incomplete installation! This installation did not install the CUDA Driver. A driver of version at least 361.00 is required for CUDA 8.0 functionality to work.

To install the driver using this installer, run the following command, replacing <CudaInstaller> with the name of this run file:

  sudo <CudaInstaller>.run -silent -driver

Logfile is /tmp/cuda_install_6388.log  
# ***安装完成***

Tensorflow官方安装历程要求注意的是:配置PATH和LD_LIBRARY_PATH和CUDA_HOME环境变量.

vim ~/.bashrc #修改配置文件（如果你用的是zsh，则需要修改 ~/.zshrc文件）

#在文件结尾处添加
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

sudo rm -rf cuda
sudo ln -s /usr/local/cuda-9.1 /usr/local/cuda