SRU validation on Mantic

netplan.io installed is 0.107-5ubuntu0.1

---
root@mantic:~# dpkg --list | grep netplan
ii  libnetplan0:amd64               0.107-5ubuntu0.1                        amd64        YAML network configuration abstraction runtime library
ii  netplan-generator               0.107-5ubuntu0.1                        amd64        YAML network configuration abstraction systemd-generator
ii  netplan.io                      0.107-5ubuntu0.1                        amd64        YAML network configuration abstraction for various backends
ii  python3-netplan                 0.107-5ubuntu0.1                        amd64        YAML network configuration abstraction Python bindings
---

After adding the reproducer from the description, netplan will fail to generate configuration:

cat > /etc/netplan/10-config.yaml <<EOF
network:
  bridges:
    mybridge:
      interfaces: [enp5s0]
  ethernets:
    enp5s0: {}
  wifis:
    wlp6s0:
      access-points:
        "mywifi":
          password: "mypassword"
EOF

---
root@mantic:~# netplan generate

** (generate:2912): WARNING **: 11:31:27.671: Permissions for /etc/netplan/10-config.yaml are too open. Netplan configuration should NOT be accessible by others.
/etc/netplan/10-config.yaml:10:9: Error in network definition: wlp6s0: Duplicate access point SSID 'mywifi'
        "mywifi":
        ^
---

At this point, Network Manager will not work anymore (because it will also call netplan generate):

---
apt install network-manager
...

root@mantic:~# nmcli con add type dummy ifname dummy0
Error: Failed to add 'dummy-dummy0' connection: Message recipient disconnected from message bus without replying

root@mantic:~# journalctl -u NetworkManager
...
Nov 24 11:31:57 mantic NetworkManager[3389]: /etc/netplan/10-config.yaml:10:9: Error in network definition: wlp6s0: Duplicate access point SSID 'mywifi'
Nov 24 11:31:57 mantic NetworkManager[3389]:         "mywifi":
Nov 24 11:31:57 mantic NetworkManager[3389]:         ^
...
---


Enabling -proposed and upgrading to netplan.io 0.107-5ubuntu0.2:


cat <<EOF >/etc/apt/preferences.d/proposed-updates
Package: src:netplan.io
Pin: release a=$(lsb_release -cs)-proposed
Pin-Priority: 501
EOF

echo "deb http://archive.ubuntu.com/ubuntu mantic-proposed main" >> /etc/apt/sources.list

apt update
apt upgrade

---
root@mantic:~# dpkg --list | grep netplan
ii  libnetplan0:amd64               0.107-5ubuntu0.2                        amd64        YAML network configuration abstraction runtime library
ii  netplan-generator               0.107-5ubuntu0.2                        amd64        YAML network configuration abstraction systemd-generator
ii  netplan.io                      0.107-5ubuntu0.2                        amd64        YAML network configuration abstraction for various backends
ii  python3-netplan                 0.107-5ubuntu0.2                        amd64        YAML network configuration abstraction Python bindings
---


Check that netplan generate and nmcli will work fine

---
root@mantic:~# netplan generate

root@mantic:~# nmcli con add type dummy ifname dummy0
Connection 'dummy-dummy0' (2c97024c-35d3-4f2d-932c-33baccae43fb) successfully added.

root@mantic:~# nmcli con show
NAME          UUID                                  TYPE   DEVICE
dummy-dummy0  f0acce7d-02ec-4e9e-93fd-d8669a2cb3d8  dummy  --
---