Comment 1 for bug 1839495

For xenail-bionic it is libvirtd:

On reboot libvirtd is failing to start:

Aug 8 16:46:23 juju-b96f6f-nova-5 systemd[1]: Starting Suspend/Resume Running libvirt Guests...
Aug 8 16:46:23 juju-b96f6f-nova-5 systemd[1]: Started Suspend/Resume Running libvirt Guests.
Aug 8 16:46:23 juju-b96f6f-nova-5 libvirtd[1812]: 2019-08-08 16:46:23.734+0000: 1908: info : libvirt version: 4.0.0, package: 1ubuntu8.11~cloud0 (Openstack Ubuntu Testing Bot <email address hidden> Tue, 18 Jun 2019 04:25:30 +0000)
Aug 8 16:46:23 juju-b96f6f-nova-5 libvirtd[1812]: 2019-08-08 16:46:23.734+0000: 1908: info : hostname: juju-b96f6f-nova-5
Aug 8 16:46:23 juju-b96f6f-nova-5 libvirtd[1812]: 2019-08-08 16:46:23.734+0000: 1908: warning : virQEMUCapsInit:1217 : Failed to get host CPU cache info
Aug 8 16:46:23 juju-b96f6f-nova-5 libvirtd[1812]: 2019-08-08 16:46:23.879+0000: 1908: warning : virLXCDriverCapsInit:85 : Failed to get host CPU cache info
Aug 8 16:46:23 juju-b96f6f-nova-5 libvirtd[1812]: 2019-08-08 16:46:23.879+0000: 1908: warning : umlCapsInit:73 : Failed to get host CPU cache info