Most of the instructions out there are far from something I would call “best practice”, so I wrote one my own.
Install Debian Keyring
debian-archive-keyring downloaded from Debian official site, through a secure connection.
wget https://deb.debian.org/debian/pool/main/d/debian-archive-keyring/debian-archive-keyring_2019.1+deb10u1_all.deb sudo apt install ./debian-archive-keyring_2019.1+deb10u1_all.deb
Required keys will be neatly shelved in directory
/etc/apt/trusted.gpg.d/, uninstalling will also be easy.
Do not use
apt-key to add keys here.
If we add keys with
apt-key, unless otherwise specified, those keys will all be jammed into file
/etc/apt/trusted.gpg. Moreover, figuring out which key is which from fingerprint before key adding/deleting is error-prone and tedious.
apt-key(8) will last be available in Debian 11 and Ubuntu 22.04.
Setup Debian Backports Suite
/etc/apt/sources.list.d/debian-buster-backports.list with following content.
deb http://deb.debian.org/debian/ buster-backports main contrib non-free # Uncomment line below then 'apt-get update' to enable 'apt-get source' #deb-src http://deb.debian.org/debian/ buster-backports main contrib non-free
The setting of
NotAutomatic: yes in its
Release file make backports deactivated by default, no additional priority adjustment needed.
ButAutomaticUpgrades: yes is also there so upgrades will be taken care of once packages are installed from this suite.
Do not use
unstable suite here.
Prepare the Kernel for DKMS
Make sure you have the latest kernel and its corresponding headers.
sudo apt update sudo apt install raspberrypi-kernel raspberrypi-kernel-headers
Reboot before proceeding.
sudo apt update sudo apt install wireguard
and you’re ready to ride.