windows10 - 求救！安装win10 | linux双系统，win10启动引导被覆盖！

Answer 1

1. Install startup manager
sudo apt-get install startupmanager

2. Open System Tools-->Startup Manager and select Win7 in the default operating system drop-down menu

This actually works, I’m happy. . . .

This is what I look for in others: link description