Installs and configures acpid to lock the session on a short power‑button press (Ubuntu 24.04).

setup-power-lock.sh

#!/usr/bin/env bash
set -euo pipefail

# 1) Install acpid if missing
if ! dpkg -s acpid >/dev/null 2>&1; then
  apt-get update
  DEBIAN_FRONTEND=noninteractive apt-get install -y acpid
fi

# 2) Enable/start it if needed
if ! systemctl is-enabled acpid >/dev/null; then
  systemctl enable acpid
fi
if ! systemctl is-active acpid >/dev/null; then
  systemctl start acpid
fi

# 3) Ensure logging is set
DEFAULTS=/etc/default/acpid
if ! grep -q -- '--logevents' "$DEFAULTS"; then
  cat >"$DEFAULTS" <<'EOF'
OPTIONS="--logevents"
EOF
fi

# 4) Drop in the event rule
RULE=/etc/acpi/events/powerbtn-lock
if ! grep -q 'lock-sessions' "$RULE"; then
  mkdir -p /etc/acpi/events
  cat >"$RULE" <<'EOF'
event=button/power.*PBTN.*
action=/usr/bin/loginctl lock-sessions
EOF
fi

# 5) Reload
systemctl restart acpid

Tested on Surface Go 2 (Ubuntu 25.04, default GNOME 48, Wayland)