No local packages or working download links found for pbr

pipでモジュールをインストールするときは、次のエラーを報告します.

    Complete output from command python setup.py egg_info:
    Download error on https://pypi.org/simple/pbr/: unknown url type: https -- Some packages may not be found!
    Couldn't find index page for 'pbr' (maybe misspelled?)
    Download error on https://pypi.org/simple/: unknown url type: https -- Some packages may not be found!
    No local packages or working download links found for pbr

なぜならpbrモジュールがないからです.解決方法:

pip install pbr