[Bug 1445322] [NEW] do-release-upgrade crashed with SystemError: E:Sub-process /usr/bin/dpkg returned an error code (1)

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This may or may not be a dupe of BUG#1438745  ....
And this is probably somehow related to my upgrading my kernel to 4.0 under 14.10 prior to upgrading to 15.04.

I had already successfully upgraded mu Ubuntu 14.10 to run the new 4.0 kernel (rebooted nicely):
~$ uname -r
4.0.0-040000-generic

So naturally, I decided to perform an early upgrade to Ubuntu 15.04:
sudo do-release-upgrade -d 

I had a few config files that I copied to prevent losing my settings while letting the defaults be installed with the upgrade:
~$ sudo cp /etc/rkhunter.conf /etc/rkhunter.conf.oldery 
~$ sudo cp /etc/default/netatalk /etc/default/netatalk.oldery 
~$ sudo cp /etc/netatalk/AppleVolumes.default /etc/netatalk/AppleVolumes.default.oldery 
(So, when the script stopped to prompt me for each file, I used a second window to sudo cp the file with .oldery - still leaving the original to be overlayed when I chose Y in the primary window).

When it got stuck (looping with this problem: bug/1438745).
(primary window kept trying and failing to configure clamav-daemon with some sort of error on line 626 unable to find or create something because nonexistent...)
I wasted a few times hitting ENTER and then 'r' to restart...

Anywhoo, I was able to open a second terminal window.  I used the new terminal window to do a few commands to try to manually run dpkg clamav-daemon (but this failed with same error).  
Then the second window crashed along with dock and only window still active was the first one.
So I entered x (instead of r to recover) and was supprised to get CLI prompt.

So I decided to use apt-get to purge the clamav-daemon package and any associated config files:
sudo apt-get -fV purge clamav-daemon 

And Since the above recommended  auto-removing clamdscan, I followed with:
sudo apt-get -fV purge clamdscan

Once that was done, I tried to install them fresh:
sudo apt-get -fV install clamav-daemon clamdscan

And it worked with no errors!! 
But it did suggest that I install a package named daemon, so I did:
sudo apt-get -fV install daemon 

And that worked with no errors!!

So I ran update and upgrade:
sudo apt-get update
sudo apt-get upgrade 
they both ran clean...

So then I rebooted:
sudo shutdown -r

And it booted up nicely into 15.04

And it was still running with the new linux kernel: 4.0.0-040000-generic
(that I had applied earlier).

I still have to restore those config file settings that were overwritten
during the upgrade:

~$ uname -r
4.0.0-040000-generic

~$ sudo cp /etc/rkhunter.conf /etc/rkhunter.conf.oldery

~$ sudo cp /etc/default/netatalk /etc/default/netatalk.oldery

~$ sudo cp /etc/netatalk/AppleVolumes.default
/etc/netatalk/AppleVolumes.default.oldery

ProblemType: Crash
DistroRelease: Ubuntu 15.04
Package: ubuntu-release-upgrader-core 1:15.04.13
Uname: Linux 4.0.0-040000-generic x86_64
ApportVersion: 2.17.1-0ubuntu2
Architecture: amd64
CrashDB: ubuntu
Date: Thu Apr 16 23:20:15 2015
DuplicateSignature: SystemError: E:Sub-process /usr/bin/dpkg returned an error code (1)
ExecutablePath: /usr/bin/do-release-upgrade
InstallationDate: Installed on 2014-06-01 (319 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
InterpreterPath: /usr/bin/python3.4
PackageArchitecture: all
ProcCmdline: /usr/bin/python3 /tmp/ubuntu-release-upgrader-o4_dohnq/vivid --mode=server --frontend=DistUpgradeViewText --devel-release
PythonArgs: ['/usr/bin/do-release-upgrade', '--mode=server', '--frontend=DistUpgradeViewText', '--devel-release']
SourcePackage: ubuntu-release-upgrader
Title: do-release-upgrade crashed with SystemError: E:Sub-process /usr/bin/dpkg returned an error code (1)
Traceback: SystemError: E:Sub-process /usr/bin/dpkg returned an error code (1)
UpgradeStatus: Upgraded to vivid on 2015-04-17 (0 days ago)
UserGroups: kismet
VarLogDistupgradeAptHistorylog:
 Start-Date: 2015-04-16  23:20:12
 Error: Sub-process /usr/bin/dpkg returned an error code (1)
 End-Date: 2015-04-16  23:20:13

** Affects: clamav (Ubuntu)
     Importance: Medium
         Status: New


** Tags: amd64 apport-crash dist-upgrade vivid
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do-release-upgrade crashed with SystemError: E:Sub-process /usr/bin/dpkg returned an error code (1)
https://bugs.launchpad.net/bugs/1445322
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