post_install() {
    if [ "$(getent group netdev | cut -d ":" -f 3)" != "86" ]; then
        groupadd -fg 86 netdev
    fi

    systemctl enable NetworkManager
}

post_upgrade() {
    systemctl restart NetworkManager
    post_install
}

pre_remove() {
    systemctl stop NetworkManager
    systemctl disable NetworkManager
}

post_remove() {
    groupdel netdev 2>/dev/null || true
}