I see apparmor DENIED messages:
[132257.005761] audit: type=1400 audit(1501333532.752:74): apparmor="DENIED" 
operation="create" profile="/usr/sbin/libvirtd" pid=32586 comm="libvirtd" 
family="netlink" sock_type="raw" protocol=0 requested_mask="create" 
denied_mask="create"


And errors from libvirt trying to connect which match the refusals from 
apparmor:
Jul 29 09:05:14 hostname libvirtd[32055]: cannot connect to netlink socket with 
protocol 0: Permission denied

I tried reproducing this issue on a fresh xenial VM, but libvirt with
apparmor worked just fine. I tried the original version from xenial, and
the update. The profile is in enforcing mode, and all I get are STATUS
messages in syslog.

Have you modified any apparmor file in /etc/apparmor.d by any chance?

One last thing to try is to upgrade from trusty to xenial, and then
install libvirt-bin.


** Changed in: libvirt (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1707400

Title:
  package libvirt-bin 1.3.1-1ubuntu10.11 failed to install/upgrade:
  subprocess installed post-installation script returned error exit
  status 1

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