cannot install with conda 4.10.3

[Takuzen Toh]

The error message I got follows.

~$ conda install byobu
Collecting package metadata (current_repodata.json): done
Solving environment: failed with initial frozen solve. Retrying with flexible solve.
Solving environment: | \ failed with repodata from current_repodata.json, will retry with next repodata source.

---

[My Environment]

~$ conda info

     active environment : base
    active env location : /Users/takuzen/ENTER
            shell level : 1
       user config file : /Users/takuzen/.condarc
 populated config files : /Users/takuzen/.condarc
          conda version : 4.10.3
    conda-build version : 3.21.5
         python version : 3.9.7.final.0
       virtual packages : __osx=10.15.7=0
                          __unix=0=0
                          __archspec=1=x86_64
       base environment : /Users/takuzen/ENTER (writable)
      conda av data dir : /Users/takuzen/ENTER/etc/conda
  conda av metadata url : None
           channel URLs : https://conda.anaconda.org/bioconda/osx-64
                          https://conda.anaconda.org/bioconda/noarch
                          https://conda.anaconda.org/conda-forge/osx-64
                          https://conda.anaconda.org/conda-forge/noarch
                          https://repo.anaconda.com/pkgs/main/osx-64
                          https://repo.anaconda.com/pkgs/main/noarch
                          https://repo.anaconda.com/pkgs/r/osx-64
                          https://repo.anaconda.com/pkgs/r/noarch
          package cache : /Users/takuzen/ENTER/pkgs
                          /Users/takuzen/.conda/pkgs
       envs directories : /Users/takuzen/ENTER/envs
                          /Users/takuzen/.conda/envs
               platform : osx-64
             user-agent : conda/4.10.3 requests/2.26.0 CPython/3.9.7 Darwin/19.6.0 OSX/10.15.7
                UID:GID : 501:20
             netrc file : None
           offline mode : False

~$ conda config --show-sources
==> /Users/***(my-user-name)/.condarc <==
channels:
  - bioconda
  - conda-forge
  - defaults