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

 遇到的两种问题：

第一种：.condarc对应的配置如下

ssl_verify: true
show_channel_urls: true

channels:
  - http://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/free/win-64/
  - http://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main/win-64/

我理解的意思是差包，部分包在对应的路径里找不到需要我们手动加入

第二种： .condarc对应的配置如下

channels:
  - https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/pytorch/win-64/
  - defaults
show_channel_urls: true
channel_alias: https://mirrors.tuna.tsinghua.edu.cn/anaconda
default_channels:
  - https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main
  - https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/free
  - https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/r
  - https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/pro
  - https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/msys2
custom_channels:
  conda-forge: https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud
  msys2: https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud
  bioconda: https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud
  menpo: https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud
  pytorch: https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud
  simpleitk: https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud

 这个加入了详细的报名，但是显示http错误，最后一番捣腾后，解决如下：核心就是https换成http并且路径要详细全面

channels:
  - http://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/pytorch/win-64/
  - defaults
show_channel_urls: true
channel_alias: http://mirrors.tuna.tsinghua.edu.cn/anaconda
default_channels:
  - http://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main
  - http://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/free
  - http://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/r
  - http://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/pro
  - http://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/msys2
custom_channels:
  conda-forge: http://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud
  msys2: http://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud
  bioconda: http://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud
  menpo: http://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud
  pytorch: http://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud
  simpleitk: http://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud

参考链接： 

Anaconda建立新的环境，出现CondaHTTPError: HTTP 000 CONNECTION FAILED for url ...... 解决过程