https://start.fedoraproject.org/
windows+Ubuntu双系统引导修复(终极版)
https://blog.csdn.net/lhj_168/article/details/75212421
重新启动后修复 现有引导菜单
Ubuntu中update-grub2与update-grub的区别
https://www.cnblogs.com/EasonJim/p/7471650.html
grub启动iso
http://www.jinbuguo.com/linux/grub.cfg.html
改默认启动顺序
http://www.ahutcloud.cn/616
sudo gedit /boot/grub/grub.cfg
找到set default=”0″
将数字0改为Windows所在的顺序
保存,重启!