Ubuntu

Update System

sudo apt upgrade -y

SSH

sudo apt update && sudo apt upgrade -y
sudo apt install openssh-server -y
sudo systemctl enable --now ssh

Logind Configuration

Disable lid switch suspend (useful for servers):

sudo vi /etc/systemd/logind.conf
# Change: HandleLidSwitch=suspend → HandleLidSwitch=ignore
sudo systemctl restart systemd-logind

Boot Target

Set non-graphical (headless)

sudo systemctl set-default multi-user.target

Set graphical (desktop)

sudo systemctl set-default graphical.target