How to enable /etc/rc.local with SystemD on Ubuntu 20.04

To enable /etc/rc.local with SystemD on Ubuntu 20.04, which does not include it by default, you can follow these steps:

1. Create the /etc/rc.local file (if it doesn’t already exist) and make it executable
   
   sudo touch /etc/rc.local sudo chmod +x /etc/rc.local
   
   
2. Add a shebang and exit 0 to the file. Open /etc/rc.local with a text editor and add the following content:
   
   #!/bin/bash
# Your startup commands here
exit 0
   
   Any commands you want to run on startup can be added before exit 0.
   
3. Create a SystemD service for rc-local:
   
   sudo nano /etc/systemd/system/rc-local.service
   
   
4. Add the following configuration to the service file:
   
   [Unit] Description=/etc/rc.local Compatibility ConditionPathExists=/etc/rc.local
[Service] Type=forking ExecStart=/etc/rc.local start TimeoutSec=0 StandardOutput=tty RemainAfterExit=yes SysVStartPriority=99
[Install] WantedBy=multi-user.target
   
   
5. Reload SystemD and enable the service:
   
   sudo systemctl daemon-reload sudo systemctl enable rc-local
   
   
6. Start the rc-local service:
   
   sudo systemctl start rc-local
   
   
7. Check if it’s running:
   
   sudo systemctl status rc-local
   

If everything is set up correctly, /etc/rc.local will now run on startup as a SystemD service on Ubuntu 20.04.