我在Ubuntu上运行virtualenvironment中的程序，允许我通过网页连接到服务器并拍摄网络摄像头照片。我正在使用pygame来拍照，它在venv之外完美运行。当我尝试在venv中安装它时：
pip install pygame
我得到了
Could not find any downloads that satisfy the requirement pygame
Some externally hosted files were ignored (use --allow-external pygame to allow).
Cleaning up...
No distributions at all found for pygame
Storing debug log for failure in /home/mmalkin/.pip/pip.log