O gerenciador de janelas i3 wm pode ser instalado diretamente no terminal com sudo apt install i3, a instalação a partir do repositório dá a vantagem das atualizações:

wget -O- https://baltocdn.com/i3-window-manager/signing.asc | gpg --dearmor > /etc/apt/trusted.gpg.d/i3wm-signing.gpg

apt install apt-transport-https --yes echo "deb https://baltocdn.com/i3-window-manager/i3/i3-autobuild/ all main" | sudo tee /etc/apt/sources.list.d/i3-autobuild.list

sudo apt update

sudo apt install i3 i3lock i3status suckless-tools -y

Configuração em ~/.config/i3/config

Extra:

sudo apt install feh fonts-font-awesome rofi pulseaudio-utils xbacklight alsa-tools clipit gcc git terminator locate pcmanfm acpi libnotify-bin i3blocks htop -y

https://medium.com/canivete-sui%C3%A7o-hacker/i3wm-no-debian-10-buster-stable
https://kifarunix.com/install-and-setup-i3-windows-manager-on-debian-11/