SHELL

update raspi

sudo apt update && sudo apt full-upgrade

Raspi Update

$ apt-get update
$ apt-get upgrade 
$ apt-get install raspberrypi-kernel-headers
$ echo "deb http://deb.debian.org/debian/ unstable main" | tee --append /etc/apt/sources.list.d/unstable.list
$ apt-get install dirmngr 
$ apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 8B48AD6246925553 
$ printf 'Package: *
Pin: release a=unstable
Pin-Priority: 150
' | tee --append /etc/apt/preferences.d/limit-unstable
$ apt-get update
$ apt-get install wireguard 
$ reboot