unbuntu与windows双系统下无法进入windows系统的问题

BIOS设置引导问题

https://blog.csdn.net/WangJiankun_ls/article/details/70853894

update grub

https://blog.csdn.net/weixin_43261805/article/details/99686668?spm=1001.2014.3001.5501

update失败，需要更新源地址

https://blog.csdn.net/yudelian/article/details/115216983

https://blog.csdn.net/qq_15776931/article/details/76919345?ops_request_misc=%257B%2522request%255Fid%2522%253A%2522163146248816780271524661%2522%252C%2522scm%2522%253A%252220140713.130102334.pc%255Fall.%2522%257D&request_id=163146248816780271524661&biz_id=0&utm_medium=distribute.pc_search_result.none-task-blog-2~all~first_rank_ecpm_v1~rank_v29_ecpm-1-76919345.pc_search_ecpm_flag&utm_term=ubuntu%E4%B8%AD%E6%97%A0%E6%B3%95update%E7%9A%84%E8%A7%A3%E5%86%B3%E6%96%B9%E6%B3%95&spm=1018.2226.3001.4187

一波操作，最后可以了