Package free:

Open root crontab sudo crontab -e
Add @reboot sh -c 'setleds +num < /dev/console' on its own line

Some users may need to run:
sudo systemctl enable cron.service

Then reboot and see it in action.

Package free:

• Open root crontab sudo crontab -e
• Add

  @reboot sh -c 'setleds +num < /dev/console'
  

  on a new line.
• Some users may need to run:

  sudo systemctl enable cron.service
  

• Then reboot and see it in action.