Comment # 13 on bug 1123699 from Michael Pujos

I'm noticing the same issue.
I have a 'default' network config marked as autostart in virt-manager,
Confirmed with:

bobbie@p72:~> sudo virsh net-list --all
 Name      State      Autostart   Persistent
----------------------------------------------
 default   inactive   yes         yes


There is no issue enabling the network manually in virt-manager

There's that dnsmasq error in the journal (see below), likely the cause of this
issue. No idea why it mentions /etc/resolv.conf being a directory. resolv.conf
is a file and a symbolic link (as expected).


bobbie@p72:~> sudo journalctl -u libvirtd
-- Logs begin at Sat 2019-03-09 16:31:52 CET, end at Sat 2019-03-09 18:30:46
CET. --
Mar 09 16:32:08 p72 systemd[1]: Starting Virtualization daemon...
Mar 09 16:32:08 p72 libvirtd[1978]: libvirt version: 5.0.0
Mar 09 16:32:08 p72 libvirtd[1978]: hostname: p72
Mar 09 16:32:08 p72 libvirtd[1978]: Failed to intialize libnetcontrol. 
Management of interface devices is disabled
Mar 09 16:32:09 p72 systemd[1]: Started Virtualization daemon.
Mar 09 16:32:09 p72 libvirtd[1978]: internal error: Unknown PCI header type
'127'
Mar 09 16:32:09 p72 libvirtd[1978]: internal error: Unknown PCI header type
'127'
Mar 09 16:32:09 p72 dnsmasq[2362]: directory /etc/resolv.conf for resolv-file
is missing, cannot poll
Mar 09 16:32:09 p72 dnsmasq[2362]: FAILED to start up
Mar 09 16:32:09 p72 libvirtd[1978]: internal error: Child process
(VIR_BRIDGE_NAME=virbr0 /usr/sbin/dnsmasq
--conf-file=/var/lib/libvirt/dnsmasq/default.conf --leasefile-ro
--dhcp-script=/us>
                                    dnsmasq: directory /etc/resolv.conf for
resolv-file is missing, cannot poll