[Unit]
Description=FirstBoot
Wants=time-sync.target
Before=rc-local.service
After=network.target time-sync.target apt-daily.service apt-daily-upgrade.service 
ConditionFileNotEmpty=/root/setup.sh

[Service]
ExecStart=/root/setup.sh
Type=oneshot
RemainAfterExit=no

[Install]
WantedBy=multi-user.target