Thomas, sorry for the slow response, I had a family issue come up.

I believe I followed the directions in comment #12 and when I rebooted,
I found myself without any working DNS at all -- no Internet hosts, no
LAN hosts, no VM guests.

I didn't troubleshoot too far because of your additional advice in
comment #16 -- which, again, I think I followed, and also does not work.
I could not resolve Internet hosts, LAN hosts. (I must admit I haven't
yet tried VM guests.)

root@hunt:~# netstat -nlp | grep :53
tcp        0      0 192.168.122.1:53        0.0.0.0:*               LISTEN      
1966/dnsmasq    
udp        0      0 0.0.0.0:5353            0.0.0.0:*                           
1388/avahi-daemon: 
udp        0      0 192.168.122.1:53        0.0.0.0:*                           
1966/dnsmasq    
udp6       0      0 :::5353                 :::*                                
1388/avahi-daemon: 


root@hunt:~# ps auxw | grep dnsmasq
118       1966  0.0  0.0  26080   996 ?        S    18:45   0:00 
/usr/sbin/dnsmasq --conf-file=/var/lib/libvirt/dnsmasq/default.conf
root@hunt:~# getent passwd 118
libvirt-dnsmasq:x:118:127:Libvirt Dnsmasq,,,:/var/lib/libvirt/dnsmasq:/bin/false


I don't understand at all where this dnsmasq is being started from, because the 
--conf-file in the /etc/init/lxc-net is left blank. There are no other 
instances of 'dnsmasq' in /etc/init/* or /etc/init.d/*.


I've attached the files I recall modifying.


** Attachment added: "etc-dhcp-dhclient.conf"
   
https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/1163147/+attachment/3743242/+files/etc-dhcp-dhclient.conf

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https://bugs.launchpad.net/bugs/1163147

Title:
  Please run dnsmasq in such a way that it can also be used on the host
  — to look up the VMs' names

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