win7+ubuntu 13.04双系统安装方法http://jingyan.baidu.com/article/60ccbceb18624464cab197ea.html
win7下制作ubuntu系统安装启动盘和U盘安装ubuntu全过程
http://blog.csdn.net/liangcaiyun2013/article/details/10410797
光盘和U盘安装win7和ubuntu14.04全步骤
http://brianway.github.io/2016/01/18/linux-win7-ubuntu-setup-by-USBandCD/