Fixing the issue with apt caused by a bad local proxy: -1- Create 99fixbadproxy at: /etc/apt/apt.conf.d/99fixbadproxy -2- Run clear.sh

99fixbadproxy

Acquire::http::Pipeline-Depth "0";
Acquire::http::No-Cache=True;
Acquire::BrokenProxy=true;

clear.sh

#!/bin/bash
sudo rm  /var/lib/apt/lists/*
sudo rm  /var/lib/apt/lists/partial/*
sudo apt-get update

another backlink:
https://askubuntu.com/a/809808

Can you explain the use and the terms in 99fixbadproxy

Inside Dockerfile add this

RUN touch /etc/apt/apt.conf.d/99fixbadproxy

RUN echo "Acquire::http::Pipeline-Depth 0;Acquire::http::No-Cache true;Acquire::BrokenProxy true;" >> /etc/apt/apt.conf.d/99fixbadproxy