Warning: Permissions for /etc/netplan/01-use-network-manager.yaml are too open. Netplan configuration should NOT be accessible by others.

[fprietog]

This warning is shown in the system journal (during boot):

nov 06 17:15:23 fpgrpi generate[840]: Permissions for /etc/netplan/01-use-network-manager.yaml are too open. Netplan configuration should NOT be accessible by others.

The file /etc/netplan/01-use-network-manager.yaml came from the package ubuntu-raspi-settings-desktop and its post install permissions are -rw-r--r-- (group and others readable).

A simple workaround is to remove the file read permission for group and others, as suggested, using this command:

sudo chmod 600 /etc/netplan/01-use-network-manager.yaml

Additional info:
----------------
OS: Ubuntu 23.10 aarch64 (Mantic)
Host: Raspberry Pi 4 Model B Rev 1.4
Kernel: 6.5.0-1006-raspi

# lsb_release -r
No LSB modules are available.
Release: 23.10

# apt-cache policy ubuntu-raspi-settings-desktop
ubuntu-raspi-settings-desktop:
  Instalados: 23.10.6
  Candidato: 23.10.6
  Tabla de versión:
 *** 23.10.6 500
        500 http://ports.ubuntu.com/ubuntu-ports mantic/main arm64 Packages
        100 /var/lib/dpkg/status

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Dave Jones (waveform)]

I'm fairly sure we can just ditch that file entirely in ubuntu-raspi-settings now, as ubuntu-desktop-settings should provide an equivalent under /lib.

[Launchpad Janitor (janitor)]

This bug was fixed in the package ubuntu-raspi-settings - 24.04.2

---------------
ubuntu-raspi-settings (24.04.2) noble; urgency=medium

  * Removed etc/netplan/01-use-network-manager.yaml: An equivalent is
    now provided under /lib by ubuntu-desktop-settings (LP: #2042866)
  * usr/share/initramfs-tools/hooks/zz-exclude-nvidia: New hook to exclude
    nvidia modules from the raspi initramfs (LP: #2060032)
  * usr/bin/update-v3d-config: Add script and corresponding service to update
    the X11 configuration for Pi 5 displays (LP: #2044718)
  * etc/X11/xorg.conf.d/99-vc4-primary.conf: Renamed to 99-v3d.conf
  * d/ubuntu-raspi-settings-desktop.lintian-overrides: Remove unknown tags,
    add tags for update-v3d-config
  * d/ubuntu-raspi-settings.lintian-overrides: Add override for appstream
    metadata
  * ubuntu-raspi-settings: Removed lz4 dependency; we removed the need for
    this in 24.04.1 when removing the obsolete initramfs-tools hack
  * Remove meson build dependency; dh_install is sufficient

 -- Dave Jones <email address hidden> Wed, 03 Apr 2024 14:37:51 +0100