Conda 找不到要安装的软件包答案

【问题标题】：Conda cannot find packages to installConda 找不到要安装的软件包
【发布时间】：2020-11-02 18:40:33
【问题描述】：

我使用 conda 已经有一段时间没有出现问题了，而刚才我在尝试安装软件包时开始出现 PackagesNotFoundError 错误。例如，如果我尝试：

conda install scipy --channel conda-forge

我得到了这个：

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

  - scipy

Current channels:

  - https://conda.anaconda.org/conda-forge/linux-64
  - https://conda.anaconda.org/conda-forge/noarch
  - https://conda.anaconda.org/bioconda/linux-64
  - https://conda.anaconda.org/bioconda/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
  - https://conda.anaconda.org/cgat/linux-64
  - https://conda.anaconda.org/cgat/noarch

To search for alternate channels that may provide the conda package you're
looking for, navigate to

    https://anaconda.org

and use the search bar at the top of the page.

但是如果我使用 anaconda 搜索这个包，我可以在 conda-forge 频道看到它。那么即使我使用anaconda建议的命令； conda install --channel https://conda.anaconda.org/conda-forge scipy，我得到了同样的错误。

在尝试解决该问题时，我重新安装了新版本的 conda，但问题仍然存在，我目前无法使用 conda 安装任何东西。有人可以告诉我出了什么问题吗？

更新

根据一些建议的建议

我已经跑了：

conda clean -all
conda clean --index-cache
conda update conda

我还是有同样的问题

我当前的 conda 版本是 4.8.2

更新 2

@merv 建议使用vervose 标志运行，所以我运行conda search -c conda-forge scipy -vvv 并得到了这个：

DEBUG conda.gateways.logging:set_verbosity(231): verbosity set to 3
Loading channels: ...working... TRACE conda.gateways.disk.test:file_path_is_writable(25): checking path is writable /path/miniconda/pkgs/urls.txt
DEBUG conda.core.package_cache_data:_check_writable(259): package cache directory '/path/miniconda/pkgs' writable: True
INFO conda.core.subdir_data:query_all(94): Ignoring the following channel urls because mode is offline.
  - https://conda.anaconda.org/conda-forge/linux-64
  - https://conda.anaconda.org/conda-forge/noarch
  - https://conda.anaconda.org/bioconda/linux-64
  - https://conda.anaconda.org/bioconda/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
  - https://conda.anaconda.org/cgat/linux-64
  - https://conda.anaconda.org/cgat/noarch
done
No match found for: scipy. Search: *scipy*
INFO conda.core.subdir_data:query_all(94): Ignoring the following channel urls because mode is offline.
  - https://conda.anaconda.org/conda-forge/linux-64
  - https://conda.anaconda.org/conda-forge/noarch
  - https://conda.anaconda.org/bioconda/linux-64
  - https://conda.anaconda.org/bioconda/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
  - https://conda.anaconda.org/cgat/linux-64
  - https://conda.anaconda.org/cgat/noarch
Traceback (most recent call last):
  File "/path/miniconda/lib/python3.6/site-packages/conda/exceptions.py", line 1079, in __call__
    return func(*args, **kwargs)
  File "/path/miniconda/lib/python3.6/site-packages/conda/cli/main.py", line 84, in _main
    exit_code = do_call(args, p)
  File "/path/miniconda/lib/python3.6/site-packages/conda/cli/conda_argparse.py", line 82, in do_call
    return getattr(module, func_name)(args, parser)
  File "/path/miniconda/lib/python3.6/site-packages/conda/cli/main_search.py", line 90, in execute
    raise PackagesNotFoundError((text_type(spec),), channels_urls)
conda.exceptions.PackagesNotFoundError: The following packages are not available from current channels:

  - scipy

Current channels:

  - https://conda.anaconda.org/conda-forge/linux-64
  - https://conda.anaconda.org/conda-forge/noarch
  - https://conda.anaconda.org/bioconda/linux-64
  - https://conda.anaconda.org/bioconda/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
  - https://conda.anaconda.org/cgat/linux-64
  - https://conda.anaconda.org/cgat/noarch

To search for alternate channels that may provide the conda package you're
looking for, navigate to

    https://anaconda.org

and use the search bar at the top of the page.

我认为Ignoring the following channel urls because mode is offline 的部分很可能与此错误有关，因为我无法从任何渠道访问包。但是，我仍然不知道如何更改 url 的模式。

【问题讨论】：

不是解决方案，但可能是一种解决方法：您可以尝试 mamba，这是 conda 的快速替代品：conda install -n base mamba，然后是 mamba install -c conda-forge scipy。
也许可以试试conda clean --index-cache？ conda search -c conda-forge scipy 会出现什么吗？另外，请在问题中添加 Conda 版本。
@merv 我现在更新了添加 conda 版本的问题。 conda clean --all 删除了很多东西，然后conda clean --index-cache 没有任何进一步的影响。最后conda search -c conda-forge scipy显示同样的错误，说明conda无法访问频道。
@Geparada 很奇怪。我想知道conda 的依赖项之一是否无法正常运行。尝试使用详细标志 (-vvv) 运行，以查看内部是否出现警告。
conda config --set offline false 应该切换该选项。希望就是这样，但不确定它最初是如何开启的。

标签： python conda anaconda3

【解决方案1】：

我终于找到了解决这个问题的方法（见 cmets）。问题出在我的 conda 配置中，我在离线模式下工作。为了解决这个问题，我刚刚跑了：

conda config --set offline false

感谢您的帮助@merv！

【讨论】：