直接conda install tensorflow-gpu=2.9.1 会显示：

PackagesNotFoundError: The following packages are not available from current channels:

  - tensorflow-gpu=2.9.1

解法1：

网上给的大多数的解决方法是 添加conda的镜像源 我添加了以下镜像源

- https://conda.anaconda.org/anaconda/linux-64
  - https://conda.anaconda.org/anaconda/noarch
  - https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/pytorch/linux-64
  - https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/pytorch/noarch
  - https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/msys2/linux-64
  - https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/msys2/noarch
  - https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/pro/linux-64
  - https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/pro/noarch
  - https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main/linux-64
  - https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main/noarch
  - https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/free/linux-64
  - https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/free/noarch
  - http://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/pytorch/linux-64
  - http://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/pytorch/noarch
  - http://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/free/linux-64
  - http://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/free/noarch
  - http://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge/linux-64
  - http://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge/noarch
  - http://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/msys2/linux-64
  - http://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/msys2/noarch
  - https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/msys2/linux-64
  - https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/msys2/noarch
  - https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge/linux-64
  - https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge/noarch
  - https://repo.anaconda.com/pkgs/main/linux-64
  - https://repo.anaconda.com/pkgs/main/noarch
  - https://repo.anaconda.com/pkgs/r/linux-64
  - https://repo.anaconda.com/pkgs/r/noarch

然而还是报同样的错误。

解法2：

在命令中指明特定的通道：conda install ‐‐channel https://conda.anaconda.org/anaconda tensorflow‐gpu=2.9.1 但是，它居然会把这条命令识别为三个安装包

PackagesNotFoundError: The following packages are not available from current channels:

  - ‐-channelt
  - //conda.anaconda.org/anaconda
  - tensorflow‐gpu=2.9.1

用conda search 了以下， tensorflow-gpu没有2.9 尝试换成2.8 就OK了