Thanks for the additional logs, those are very curious..
"""
Sep 5 05:55:40 MonacoSIT4 NetworkManager[3448]: <warn> [1725530140.8548]
keyfile: load:
"/run/NetworkManager/system-connections/netplan-ens5f1np1.nmconnection": failed
to load connection: cannot access file: No such file or directory
"""
"netplan-ens5f1np1.nmconnection" is clearly a Netplan generated
connection profile, that NetworkManager is apparently aware of,
otherwise it wouldn't try loading it. But at the time of reading it, it
seems to be gone (deleted?).
I'm not exactly sure what's happening here, maybe some race condition
with a "systemd daemon-reload" running in parallel, that makes Netplan
delete and re-generate the configuration files at the very same time
that NM tries reading them. This needs more investigation.
** Also affects: netplan.io (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2083129
Title:
[Lenovo Ubuntu 24.04.4 Bug] netplan static IP address assignment use
NetworkManager as renderer would be lost static ip
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