On 28/05/2025 06:44, accipiter wrote:
Oh - sorry forgot: there's *nothing* in /etc/network/interfaces.d/

While I have no reason to not trust you, it would be more convincing to post exact command and its output, e.g.

  grep -RE '^\s*[^#]' /etc/network/interfaces /etc/network/interfaces.d

In /etc/NetworkManager/system-connections/ there is a file: eth0.nmconnection which appears to have the "right stuff" - pointing to the UUID of the connection that I want.

Maybe you are not comfortable posting output of commands like

    nmcli connection
    nmcli device

Unfortunately it means that nobody from this list may spot something unusual in your configuration. The area for speculation is too broad: maybe missed "nmcli device reaply", maybe conflict with another tool. You may still read logs, try various tools like D-Bus monitor, strace, debugger. You may create a VM or may experiment with a live image.

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