package uvtool-libvirt 0~bzr99-0ubuntu1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

Upgrade from 14.04 x64 to 16.04 using sudo do-release-upgrade -d

Setting up ubuntu-mono (14.04+16.04.20160415-0ubuntu1) ...
Processing triggers for systemd (229-4ubuntu4) ...
Processing triggers for initramfs-tools (0.122ubuntu8) ...
update-initramfs: Generating /boot/initrd.img-4.4.0-21-generic
ERROR: Cannot create report: [Errno 17] File exists: '/var/crash/uvtool-libvirt.0.crash'
                                                                                        W: plymouth: The plugin label.so is missing, the selected theme might not work as expected.
W: plymouth: You might want to install the plymouth-themes and plymouth-label package to fix this.
Processing triggers for ureadahead (0.100.0-19) ...
Processing triggers for libc-bin (2.23-0ubuntu3) ...
Processing triggers for ca-certificates (20160104ubuntu1) ...
Updating certificates in /etc/ssl/certs...
0 added, 0 removed; done.
Running hooks in /etc/ca-certificates/update.d...
done.
Processing triggers for resolvconf (1.78ubuntu2) ...
Processing triggers for libgdk-pixbuf2.0-0:amd64 (2.32.2-1ubuntu1) ...
Processing triggers for dbus (1.10.6-1ubuntu3) ...
Errors were encountered while processing:
 uvtool-libvirt
Error in function:

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........................ERROR: hook /usr/share/apport/general-hooks/ubuntu.py crashed:
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/apport/report.py", line 197, in _run_hook
    symb['add_info'](report, ui)
  File "/usr/share/apport/general-hooks/ubuntu.py", line 66, in add_info
    check_attachment_for_errors(report, attachment)
  File "/usr/share/apport/general-hooks/ubuntu.py", line 170, in check_attachment_for_errors
    trim_dpkg_log(report)
  File "/usr/share/apport/general-hooks/ubuntu.py", line 468, in trim_dpkg_log
    report['DpkgTerminalLog'] = '\n'.join([str(line.encode('utf-8')) for line in lines])
  File "/usr/share/apport/general-hooks/ubuntu.py", line 468, in <listcomp>
    report['DpkgTerminalLog'] = '\n'.join([str(line.encode('utf-8')) for line in lines])
AttributeError: 'bytes' object has no attribute 'encode'
.

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No pending crash reports. Try --help for more information.

Could not install the upgrades

The upgrade has aborted. Your system could be in an unusable state. A
recovery will run now (dpkg --configure -a).

Setting up uvtool-libvirt (0~bzr99-0ubuntu1) ...
2016/04/23 15:08:44 socat[14614] E connect(5, AF=1 "/var/run/libvirt/libvirt-sock", 31): No such file or directory
libvirtd does not appear to be listening on "/var/run/libvirt/libvirt-sock".
On Ubuntu, libvirtd is managed with the "libvirt-bin" upstart job.
Repair libvirtd, then reconfigure uvtool-libvirt with:
    sudo apt-get -f install
dpkg: error processing package uvtool-libvirt (--configure):
 subprocess installed post-installation script returned error exit status 1
Errors were encountered while processing:
 uvtool-libvirt

Upgrade complete

The upgrade has completed but there were errors during the upgrade
process.

To continue please press [ENTER]
=== Command detached from window (Sat Apr 23 15:09:22 2016) ===
=== Command terminated with exit status 1 (Sat Apr 23 15:09:32 2016) ===

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: uvtool-libvirt 0~bzr99-0ubuntu1
ProcVersionSignature: Ubuntu 3.16.0-70.90~14.04.1-generic 3.16.7-ckt25
Uname: Linux 3.16.0-70-generic x86_64
ApportVersion: 2.20.1-0ubuntu2
Architecture: amd64
Date: Sat Apr 23 15:02:36 2016
ErrorMessage: subprocess installed post-installation script returned error exit status 1
InstallationDate: Installed on 2015-08-03 (263 days ago)
InstallationMedia: Ubuntu-Server 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
PackageArchitecture: all
RelatedPackageVersions:
 dpkg 1.18.4ubuntu1
 apt 1.2.10ubuntu1
SourcePackage: uvtool
Title: package uvtool-libvirt 0~bzr99-0ubuntu1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
UpgradeStatus: Upgraded to xenial on 2016-04-23 (0 days ago)