[Bug]: NetworkManager-wait-online.service not enabled when NM used - means services that require working network start prematurely and fail

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      1. What happened?

I have observed this issue running Armbian v25.2.1 for Tinker Board running Armbian Linux 6.12.16-current-rockchip (Ubuntu noble server image).

This image uses NetworkManager for network config. When NM is used the NetworkManager-wait-online.service must be enabled so that network-online.target is not reached until NetworkManager has brought up all the interfaces. Service units that require the network to be up before starting rely on network-online.target working correctly otherwise they will likely fail on boot (which is the problem I observed).

See [the systemd documentation](https://systemd.io/NETWORK_ONLINE/), in particular the first two FAQs.

I encountered this problem when trying to set up a dhcp server, using the isc-dhcpd-server package. I correctly configured the dhcp server, enabled its unit and restarted it. It worked. However when I rebooted the Pi the dhcp server failed to start claiming "there was no subnet definition for end0". I figured out that this was because at the time isc-dhcp-server was starting the network had not yet come up, so dhcpd could not obtain the IP address & netmask for the interface to match with the subnet definition in the config file.

Reading the systemd documentation (linked above) I ran the suggested command to see if the wait services were enabled:

```
$ systemctl is-enabled NetworkManager-wait-online.service systemd-networkd-wait-online.service
disabled
disabled
```

This reveals that NetworkManager-wait-online.service is disabled, when it should be enabled when NM is used to configure the network.

I enabled NetworkManager-wait-online.service and then rebooted. The dhcp server started correctly.

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      1. How to reproduce?

In a running Armbian system execute the following command (from the systemd documentation) and verify that the correct wait unit (depending on how network configuration is done in the image) is enabled:

```
$ systemctl is-enabled NetworkManager-wait-online.service systemd-networkd-wait-online.service
disabled
enabled

```

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      1. Branch

main (main development branch)

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      1. On which host OS are you running the build script and observing this problem?

Other

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      1. Are you building on Windows WSL2?

• [ ] Yes, my Ubuntu/Debian/OtherOS is running on WSL2

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      1. Relevant log URL

No response

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      1. Code of Conduct

• [x] I agree to follow this project's Code of Conduct

Raised by: https://github.com/daniel-ayers

https://github.com/armbian/build/issues/7896