Yes you're right about the Desktop ISO. When last I checked, it only
supported partial autoinstall support. I might use that in future.

But I do still think there could be something wrong here.

The main issue is quite reproducable and the behaviour is different
between 22.04 and 24.04.

On a fresh install of Ubuntu 22.04 server: After installing 
ubuntu-desktop-minimal, the network is unaffected and DNS server information is 
retained. Networkd still has control of the interface.
On a fresh install of Ubuntu 24.04 server: After you install 
ubuntu-desktop-minimal, you end up in the situation I described where DNS 
server information is lost.

Of course, you can run extra commands to updated the netplan config,
bring down/up the relevant interfaces, and/or reboot but this could be
difficult if you're working over SSH, or trying to automate the process.

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https://bugs.launchpad.net/bugs/2097769

Title:
  Installation of ubuntu-desktop-minimal breaks DNS

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