Comment 7 for bug 1802906

Yes, it worked - as soon as the new packages were installed. Thank you!

root@bionic:~# ls
libvirt-bin_4.0.0-1ubuntu8.7~ppa2_amd64.deb
libvirt-clients_4.0.0-1ubuntu8.7~ppa2_amd64.deb
libvirt-daemon-driver-storage-rbd_4.0.0-1ubuntu8.7~ppa2_amd64.deb
libvirt-daemon-system_4.0.0-1ubuntu8.7~ppa2_amd64.deb
libvirt-daemon_4.0.0-1ubuntu8.7~ppa2_amd64.deb
libvirt0_4.0.0-1ubuntu8.7~ppa2_amd64.deb
root@bionic:~# dpkg -i *.deb
(Reading database ... 30717 files and directories currently installed.)
...
root@bionic:~# ifconfig virbr0
virbr0: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500
        inet 192.168.122.1 netmask 255.255.255.0 broadcast 192.168.122.255
        ether 52:54:00:11:cc:e6 txqueuelen 1000 (Ethernet)
        RX packets 0 bytes 0 (0.0 B)
        RX errors 0 dropped 0 overruns 0 frame 0
        TX packets 0 bytes 0 (0.0 B)
        TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

root@bionic:~# virsh net-destroy default
Network default destroyed

root@bionic:~# virsh net-start default
Network default started