Public bug reported:

Hi,

with : 
- ubuntu server 18.04 freshly installed 
- network bridge configured with netplan   ( by default now ) 

the bridge network ( br0 ) is not seem by libvirt tools
  ( either virsh iface-list, nor virt-manager )

the bridge ( br0 ) is defined in netplan like this : 
----- cut here -----
network:
  ethernets:
    enp2s0:
      optional: true
  bridges:
    br0:
      addresses:
        - 192.168.8.12/24
      dhcp6: false
      gateway4: 192.168.8.1
      nameservers:
        search:
          - home.dan
        addresses:
          - 192.168.8.2         
      optional: true
      interfaces:
        - enp2s0
      parameters:
        stp: yes
        forward-delay: 0
  version: 2
----- cut here -----

the network bridge is working perfectly, but is not seen by libvirt
i have tried  several parameters ( stp, forward-delay ...) but nothing change.

if i revert back the network configuration to ifupdown
( installing ifupdown package, removing netplan config file, and creating 
/etc/network/interface )

then the libvirt tools ( virsh or virt-manager ) are working again with
the defined bridge.

Best Regards

** Affects: libvirt (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1770345

Title:
  libvirt not compatible with netplan

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