root@palacios-rasb:/home/pi# cat /etc/systemd/system/compartirint.service 
# Añadir
[Unit]
 Description=/root/palacios.sh Compatibility
 ConditionPathExists=/root/palacios.sh
 After=network-online.target
 Wants=network.target network-online.target
 
 
[Service]
 Type=forking
 ExecStart=/root/palacios.sh start
 TimeoutSec=0
 StandardOutput=tty
 RemainAfterExit=yes
 
[Install]
 WantedBy=multi-user.target
 
 
https://www.zeppelinux.es/como-habilitar-rc-local-en-debian-9-stretch/
chmod +x /root/palacios.sh
systemctl enable compartirint
systemctl start compartirint.service
 
systemctl daemon-reload

Referencias