A: the establishment of apt.conf files in the / etc / apt / directory to add the following
Acquire::http::Proxy "http://proxyxxxxxxx:port";
Note formats: Finally; end
Storage
carried out
sudo apt-get update
ok .........
two:
Source 163 attached debian10
deb http://mirrors.163.com/debian/ buster main non-free contrib
deb http://mirrors.163.com/debian/ buster-updates main non-free contrib
deb http://mirrors.163.com/debian/ buster-backports main non-free contrib
deb-src http://mirrors.163.com/debian/ buster main non-free contrib
deb-src http://mirrors.163.com/debian/ buster-updates main non-free contrib
deb-src http://mirrors.163.com/debian/ buster-backports main non-free contrib