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~$ su -

~# /usr/lib/apt/apt-helper download-file https://debian.sur5r.net/i3/pool/main/s/sur5r-keyring/sur5r-keyring_2020.02.03_all.deb keyring.deb SHA256:c5dd35231930e3c8d6a9d9539c846023fe1a08e4b073ef0d2833acd815d80d48

~# dpkg -i ./keyring.deb 

~# echo "deb https://debian.sur5r.net/i3/ $(grep '^DISTRIB_CODENAME=' /etc/lsb-release | cut -f2 -d=) universe" >> /etc/apt/sources.list.d/sur5r-i3.list

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~#apt update

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~#apt install i3