Failed to Enable UPnP: upnpd.service Not a Native Service - Fix Guide

This error, 'failed to enable upnpd: upnpd.service is not a native service, redirecting to systemd-sysv-install. Executing: /lib/systemd/systemd-sysv-install enable upnpd update-rc.d: error: upnpd Default-Start contains no runlevels, aborting. : exit status 1', occurs because the upnpd service startup script lacks runlevel information. Specifically, the 'Default-Start' field in the upnpd service startup script doesn't specify any runlevels, preventing the service from installing correctly.

To resolve this, you can manually edit the upnpd service startup script, add the 'Default-Start' field, and specify the appropriate runlevels. Alternatively, try starting the upnpd service manually using the 'systemctl' command.

Remember, specific solutions might vary based on your operating system version and service version. Consulting your operating system and service's official documentation or community support is recommended for accurate solutions.