debian source

https://mirrors.163.com/debian-cd/12.1.0/amd64/iso-dvd/
https://www.debian.org/CD/http-ftp/#mirrors

https://www.debian.org/mirror/list

https://www.debian.org/CD/
https://cdimage.debian.org/debian-cd/current/amd64/iso-dvd/

https://mirror.tuna.tsinghua.edu.cn/help/debian/

sudo

Username Is Not In The Sudoers File

su -
usermod -a -G sudo Name
reboot