环境：certbot使用

报错：

...
Creating virtual environment...
usage: virtualenv [--version] [--with-traceback] [-v | -q] [--app-data APP_DATA] [--clear-app-data] [--discovery {builtin}] [-p py] [--creator {builtin,cpython2-posix}] [--seeder {app-data,pip}] [--no-seed] [--activators comma_sep_list]
                  [--clear] [--system-site-packages] [--symlinks | --copies] [--download | --no-download] [--extra-search-dir d [d ...]] [--pip version] [--setuptools version] [--wheel version] [--no-pip] [--no-setuptools] [--no-wheel]
                  [--symlink-app-data] [--prompt prompt] [-h]
                  dest
virtualenv: error: unrecognized arguments: --no-site-packages
...

参考：https://blog.csdn.net/ustbbsy/article/details/104546618

没有这个参数 –no-site-packages ，是 virtualenv 版本问题。升级：

pip3 install --upgrade virtualenv==16.7.9