public_network plugin doesn't find bridges on Ubuntu 22.04

[harenber]

Describe the bug
Vagrantfile containing

    j2.vm.network "public_network",
                    :dev => "virbr0",
                    :mode => "bridge",
                    :type => "bridge",
                    :ip => "10.1.1.1",
                    :netmask => "255.255.0.0"

gives the following error message on Ubuntu 22.04:

Libvirt Provider:
* network configuration 1 for machine jem2 is a public_network referencing host device 'virbr0' which does not exist, consider adding ':dev => ....' referencing one of eno3, eno1np0, eno4, eno2np1, enp94s0f0np0, enp94s0f1np1, eno1np0.910, eno1np0.108, eno1np0.104

The same configuration works fine on a Ubuntu 20.04 machine running the same version of the libvirt plugin.

virbr0 is existing:

root@jemserver:~/Vagrantfiles/jem1_2_alma9# ifconfig virbr0
virbr0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 132.195.XXX.XXX  netmask 255.255.254.0  broadcast 132.195.125.255
        inet6 fe80::84d4:13ff:fe4a:ac58  prefixlen 64  scopeid 0x20<link>
        inet6 XXXX  prefixlen 64  scopeid 0x0<global>
        ether 86:d4:13:4a:ac:58  txqueuelen 1000  (Ethernet)
        RX packets 439666  bytes 1360458757 (1.3 GB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 52060  bytes 6176749 (6.1 MB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

root@jemserver:~/Vagrantfiles/jem1_2_alma9# brctl show virbr0
bridge name	bridge id		STP enabled	interfaces
virbr0		8000.86d4134aac58	no		eno1np0
							vnet4
root@jemserver:~/Vagrantfiles/jem1_2_alma9# 

and also libvirt sees it:

root@jemserver:~/Vagrantfiles/jem1_2_alma9# virsh -c qemu:///system iface-list --all
 Name           State      MAC Address
----------------------------------------------
 docker0        inactive   02:42:b5:39:bd:32
 eno2np1        inactive   bc:97:e1:a6:bc:95
 eno3           inactive   bc:97:e1:a6:bc:92
 eno4           inactive   bc:97:e1:a6:bc:93
 enp94s0f0np0   inactive   bc:97:e1:cd:e4:90
 enp94s0f1np1   inactive   bc:97:e1:cd:e4:91
 lo             inactive   00:00:00:00:00:00
 virbr0         active     86:d4:13:4a:ac:58
 virbr0.104     active     66:c7:1f:ee:84:fb
 virbr0.108     active     9e:13:93:0b:0d:f2
 virbr0.910     active     36:ef:6a:e7:4b:a2

Maybe related to #1786 as we see this problem on Ubuntu 22.04 as well.

To Reproduce

Use the following Vagrantfile on an Ubuntu 22.04 host:

Vagrant.configure("2") do |config|

  #
  # JEM1
  #
  
  config.vm.define :jem1 do |j1|
    config.vm.provider :libvirt do |libvirt|
      libvirt.storage_pool_name = 'default'
      libvirt.cpus = 4
      libvirt.memory = 8192
      libvirt.management_network_mode = "none"
      libvirt.default_prefix = ""
      libvirt.machine_virtual_size = 200 # in GB
      libvirt.qemu_use_session = false
    end

    j1.vm.host_name = "jem1"
    j1.vm.box = "roboxes/alma9"
    j1.vm.box_check_update = false

    j1.vm.network "public_network",
                    :dev => "virbr0",
                    :mode => "bridge",
                    :type => "bridge",
                    :ip => "10.1.1.1",
                    :netmask => "255.255.0.0"

    j1.vm.provision "ansible" do |ansible|
      ansible.playbook = "ansible.yml"
    end

  end

Expected behavior

VM should be created. The same Vagrantfile is working on an Ubuntu 20.04 host pointing to a similar bridged device.

Screenshots

Versions (please complete the following information)::

• Libvirt version: 0.12.2
• Vagrant version [output of vagrant version]: 2.4.0
• Vagrant flavour [Upstream or Distro]: Upstream
• Vagrant plugins versions (including vagrant-libvirt) [output of vagrant plugin list]: vagrant-libvirt (0.12.2, global) is the only line

Debug Log
Attach Output of VAGRANT_LOG=debug vagrant ... --provider=libvirt >vagrant.log 2>&1

See here

A Vagrantfile to reproduce the issue:

See above

[harenber]

Just to mention that the problem is still there with a newer version of Vagrant:

root@jemserver:~# libvirtd -V
libvirtd (libvirt) 8.0.0
root@jemserver:~# vagrant version
Installed Version: 2.4.1
Latest Version: 2.4.1

You're running an up-to-date version of Vagrant!
root@jemserver:~# vagrant plugin list
vagrant-libvirt (0.12.2, global)
root@jemserver:~#