Linux
https://cdimage.debian.org/debian-cd/current/amd64/bt-dvd/
http://ftp.sjtu.edu.cn/ubuntu-cd/
http://archive.ubuntu.com/ubuntu/dists/bionic-updates/main/installer-amd64/current/images/netboot/mini.iso
( Mirror only http://us.archive.ubuntu.com/ , need proxy, local DNS not working )
Debug: Console 4 or /var/log/syslog
apt install netselect-apt && netselect-apt -c china --nonfree
mv /etc/apt/sources.list /etc/apt/sources.list.ori && mv sources.list /etc/apt/
https://www.gnu.org/software/bash/manual/bash.html
url=https://raw.githubusercontent.com/fzinfz/scripts/master/init.sh # alias & functions
source /dev/stdin <<< "$(curl -sS $url)"