我正在尝试使用虚拟盒子设置虚拟机。我在Windows 7 64位计算机上安装了虚拟盒子和无业游民。我还使用puphpet构建了一个环境。但是，每当我尝试安装ubuntu1404-x64盒子时，它都会引发错误
Bringing machine 'machine1' up with 'virtualbox' provider...
==>Machine1: Box 'puphpet/ubuntu1404-x64' could not be found. Attempting to find and install...
machine1: Box Provider: virtualbox
machine1: Box Version: >= 0
machine1: Box file was not detected as metadata. Adding it directly...
machine1: Adding box 'puphpet/ubuntu1404-x64' (v0) for provider: virtualbox
machine1: Downloading: puphpet/boxes/ubuntu1404-x64
machine1:
An error occurred while downloading the remote file. The error message, if any, is reproduced below. Please fix this error and try again.
我检查了URL https://atlas.hashicorp.com/puphpet/boxes/ubuntu1404-x64/，框puphpet …