*********
Configure
*********

Keys
====

.. code:: shell

  apt-key add "path/to/key/file"

Configuration
=============

* etc/apt/apt.conf

::

  APT::Get::Show-Versions true;
  Dpkg::Progress-Fancy true;

  Acquire::Check-Valid-Until false;

* etc/apt/preferences

::

  Package: *
  Pin: release n=stretch-backports
  Pin-Priority: 400

  Package: *
  Pin: release n=buster
  Pin-Priority: 200

  Package: *
  Pin: release n=sid
  Pin-Priority: 100

* etc/apt/sources.list

deb.debian.org ↔ ftp.cc.debian.org
file:/path

::

  deb http://deb.debian.org/debian stretch main contrib non-free
  deb http://deb.debian.org/debian stretch-backports main contrib non-free
  deb http://deb.debian.org/debian stretch-updates main contrib non-free
  deb http://security.debian.org stretch/updates main contrib non-free

  deb http://deb.debian.org/debian buster main contrib non-free
  deb http://security.debian.org buster/updates main contrib non-free

  deb http://deb.debian.org/debian sid main contrib non-free