概要

conda のdefault channelにないものを探す
conda-forge channelにお世話になる
conda install -c conda-forge package-name するのは面倒
default を優先しつつ、存在しないときは conda-forgeから探すように設定する

reference

https://github.com/conda/conda-docs/blob/master/docs/source/user-guide/tasks/manage-channels.rst
Conda also now has a command that adds the new channel to the bottom of the channel list, making it the lowest priority:

run command and confirm

conda config --append channels conda-forge

# cat  ~/.condarc
channels:
  - defaults
  - conda-forge

# conda config --get channels
--add channels 'conda-forge'   # lowest priority
--add channels 'defaults'   # highest priority