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/etc/apt package manager configuration, sources, and scripts

• apt-key-add scripts to download and install Apt secure keys; run all these.
• installers scripts to download and install packages; run the ones you want.
• sources.list.d files for configuring Apt sources; put all these in /etc/apt/
• sources misc files and works-in-progress for adding sources; most will go into sources.list.d