"Cound not install 'syslinux-themes-debian'" in Cleaning up phase of GUI Kubuntu 14.10 upgrade

[skierpage]

(This is a duplicate of bug #1385016, but `apport-collect 1385016` tells me not to report a dupe, so I used `ubuntu-bug ubuntu-release-upgrader` to file this even though it tells me not to file a new bug. ?!)

Similar to bug #1385016, but I followed https://help.ubuntu.com/community/UtopicUpgrades/Kubuntu to run the GUI release upgrade.

Just like that bug, the alert dialog has "subprocess installed post-removal script returned error exit status 127"

It's in the Cleaning up phase and /var/log/dkpg.log has

2014-10-25 17:56:48 status installed syslinux-themes-debian:all 12-3
2014-10-25 17:56:48 remove syslinux-themes-debian:all 12-3 <none>
2014-10-25 17:56:48 status half-configured syslinux-themes-debian:all 12-3
2014-10-25 17:56:48 status half-installed syslinux-themes-debian:all 12-3
2014-10-25 17:56:49 status installed syslinux-themes-debian-wheezy:all 12-3
2014-10-25 17:56:49 remove syslinux-themes-debian-wheezy:all 12-3 <none>
2014-10-25 17:56:49 status half-configured syslinux-themes-debian-wheezy:all 12-3
2014-10-25 17:56:49 status half-installed syslinux-themes-debian-wheezy:all 12-3
2014-10-25 17:56:51 status config-files syslinux-themes-debian-wheezy:all 12-3
2014-10-25 17:56:51 status config-files syslinux-themes-debian-wheezy:all 12-3

So I think the upgrader is trying to remove this package, not install it.

I tried reporting this from the [Report bug] button in the Error dialog, but that failed with
  Chromium can not be run as root.
  Please start Chromium as a normal user. ...

ProblemType: Bug
DistroRelease: Ubuntu 14.10
Package: ubuntu-release-upgrader-core 1:14.10.9
ProcVersionSignature: Ubuntu 3.13.0-38.65-generic 3.13.11.8
Uname: Linux 3.13.0-38-generic x86_64
ApportVersion: 2.14.7-0ubuntu8
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: KDE
Date: Sat Oct 25 18:36:38 2014
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
Symptom: ubuntu-release-upgrader
UpgradeStatus: Upgraded to utopic on 2014-10-26 (0 days ago)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Brian Murray (brian-murray)]

From Apttermlog.txt:

Removing syslinux-themes-debian (12-3) ...^M
/var/lib/dpkg/info/syslinux-themes-debian.postrm: 15: /var/lib/dpkg/info/syslinux-themes-debian.postrm: extlinux-update: not found^M
dpkg: error processing package syslinux-themes-debian (--remove):^M
 subprocess installed post-removal script returned error exit status 127^M