我正在使用 Wubi 安装程序安装 Ubuntu，但它意外结束并出现以下错误：
12-27 15:15 DEBUG downloader: downloading http://releases.ubuntu.com/11.04/ubuntu-11.04-desktop-amd64.metalink > G:\ubuntu\install
12-27 15:15 DEBUG downloader: Download start filename=G:\ubuntu\install\ubuntu-11.04-desktop-amd64.metalink, url=http://releases.ubuntu.com/11.04/ubuntu-11.04-desktop-amd64.metalink, basename=ubuntu-11.04-desktop-amd64.metalink, length=28363, text=None
12-27 15:15 DEBUG downloader: download finished (read 28363 bytes)
12-27 15:15 DEBUG downloader: downloading http://releases.ubuntu.com/11.04/MD5SUMS-metalink > G:\ubuntu\install
12-27 15:15 ERROR TaskList: [Errno 14] HTTP Error 404: Not Found
Traceback (most recent call last):