Solving environment: failed with initial frozen solve. Retrying with flexible solve.

Conda安装软件出现提示：

Solving environment: failed with initial frozen solve. Retrying with flexible solve.

需要升级Conda版本，升级流程：

首先conda update（注意在base环境下），看一下系统给的更新命令：

conda update --prefix /Users/mcj/opt/anaconda3 anaconda

(base) 
# mcj @ machunjiedeMacBook-Pro in ~/Downloads [22:02:46] 
$ conda update

CondaValueError: no package names supplied
# If you want to update to a newer version of Anaconda, type:
#
# $ conda update --prefix /Users/mcj/opt/anaconda3 anaconda


(base) 
# mcj @ machunjiedeMacBook-Pro in ~/Downloads [22:02:52] C:1
$ conda update --prefix /Users/mcj/opt/anaconda3 anaconda
Collecting package metadata (current_repodata.json): done
Solving environment: done


==> WARNING: A newer version of conda exists. <==
  current version: 4.8.2
  latest version: 22.11.1

Please update conda by running

    $ conda update -n base -c defaults conda



## Package Plan ##

  environment location: /Users/mcj/opt/anaconda3

  added / updated specs:
    - anaconda


The following packages will be downloaded:

    package                    |            build
    ---------------------------|-----------------
    _anaconda_depends-2022.05  |           py37_0           7 KB  http://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main
    aiohttp-3.8.3              |   py37h6c40b1e_0         426 KB  http://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main
    aiosignal-1.2.0            |     pyhd3eb1b0_0          12 KB  http://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main
    alabaster-0.7.12           |           py37_0          18 KB  http://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main
    anaconda-custom            |           py37_1           3 KB  http://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main
    anaconda-client-1.11.0     |   py37hecd8cb5_0         148 KB  http://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main

然后conda update --all：

# mcj @ machunjiedeMacBook-Pro in ~/Downloads [22:26:53] 
$ conda update --all
Collecting package metadata (current_repodata.json): done
Solving environment: | 
Warning: 2 possible package resolutions (only showing differing packages):
  - http://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main/osx-64::cython-0.29.28-py37he9d5cce_0, http://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main/osx-64::gensim-4.2.0-py37he9d5cce_0
  - http://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main/osx-64::cython-0.29.32-py37he9d5cce_0, http://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main/osx-64::gensim-4.1.2-py37he9d5ccedone

## Package Plan ##

  environment location: /Users/mcj/opt/anaconda3


The following packages will be downloaded:

    package                    |            build
    ---------------------------|-----------------
    _ipyw_jlab_nb_ext_conf-0.1.0|   py37hecd8cb5_1           5 KB  http://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main
    anaconda-navigator-2.3.2   |   py37hecd8cb5_0         6.5 MB  http://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main
    cctools-949.0.1            |      h9abeeb2_25          18 KB  http://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main
    cctools_osx-64-949.0.1     |      hc7db93f_25         1.3 MB  http://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main
    conda-build-3.23.3         |   py37hecd8cb5_0         566 KB  http://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main
    conda-env-2.6.0            |                1           3 KB  http://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main
    conda-repo-cli-1.0.24      |   py37hecd8cb5_0         115 KB  http://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main
    conda-verify-3.4.2         |             py_1          27 KB  http://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main
    flask-1.1.2                |     pyhd3eb1b0_0          70 KB  http://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main
    jinja2-2.10.1              |           py37_0         195 KB  http://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main

OK了，问题解决。