deepin

Ubuntu下无法使用add-apt-repository命令
https://my.oschina.net/u/1011130/blog/1840013

apt-get install software-properties-common

http://tieba.baidu.com/p/5185706072
apt-get install dirmngr

anzhuang qu chu ren zheng

https://www.cnblogs.com/schips/p/10141278.html

shou dong xie zai grub

Deepin更换镜像源
https://blog.csdn.net/baidu_41751590/article/details/89064220
/etc/apt/sources.list
http://ftp.sjtu.edu.cn/deepin/
http://mirrors.aliyun.com/deepin

Boot successfully repaired.

Please write on a paper the following URL:
http://paste.ubuntu.com/p/xJZPvWmS93/

In case you still experience boot problem, indicate this URL to:
boot.repair@gmail.com or to your favorite support forum.

You can now reboot your computer.
Please do not forget to make your BIOS boot on sdb1/EFI/ubuntu/shimx64.efi file!

If your computer reboots directly into Windows, try to change the boot order in your BIOS.
If your BIOS does not allow to change the boot order, change the default boot entry of the Windows bootloader.
For example you can boot into Windows, then type the following command in an admin command prompt:
bcdedit /set {bootmgr} path \EFI\ubuntu\shimx64.efi

来源：https://www.cnblogs.com/cjdty/p/12302078.html