Comment 2 for bug 2008952

journalctl on a failed laptop is showwing a lot of throttling logs from NetworkManager such as :

  stat change: unavilable -> disconnected (reason 'carrier changed', sys-iface-state: 'managed')

This makes be believe that networkd and NetworkManager are attempting to grab management of the NIC multiple times throughout boot thereby rendering the network and carrier down.

I see cloud-init reflecting the 'down' carrier state of en0s31f6 in the 'init' timeframe too by

 Cloud-init v. 23.1.1-0ubuntu1 running 'init' at Tue, 07 Mar 2023 03:17:56 +0000. Up 62.47 seconds.
ci-info: +++++++++++++++++++++++++++++Net device info+++++++++++++++++++++++++++++
ci-info: +-----------+-------+-----------+-----------+-------+-------------------+
ci-info: | Device | Up | Address | Mask | Scope | Hw-Address |
ci-info: +-----------+-------+-----------+-----------+-------+-------------------+
ci-info: | enp0s31f6 | False | . | . | . | 6c:24:08:9e:54:e6 |
ci-info: | lo | True | 127.0.0.1 | 255.0.0.0 | host | . |
ci-info: | lo | True | ::1/128 | . | host | . |
ci-info: | wlp0s20f3 | False | . | . | . | 38:7a:0e:2d:d0:bb |
ci-info: +-----------+-------+-----------+-----------+-------+-------------------+

2. The second interesting configuration 'error' to be aware of is that netplan doesn't like the 644 permissions on the rendered /etc/netplan/01-network-manager-all.yaml.

** (process:2015): WARNING **: 03:18:08.594: Permissions for /etc/netplan/01-network-manager-all.yaml are too open. Netplan configuration should NOT be accessible by others.

Full log paste: https://dpaste.com/APGZH46PN