subprocess post-installation script killed by signal (Segmentation fault), core dumped

Binary package hint: update-manager

Updating from fiesty to gutsy Kubuntu.

Terminal output as follows:
fjs@pc1:~$ sudo adept_updater
Password:
kapture::PkgSystem::PkgSystem()
fjs@pc1:~$ sudo adept_updater
kapture::PkgSystem::PkgSystem()
debconf
adduser
sysklogd
snort-mysql
oinkmaster
kdecore (KProcess): WARNING: _attachPty() 33
debconf
adduser
sysklogd
snort-mysql
oinkmaster
amarok-xine
ruby
python-qt3
lsb-release
kdebase-kio-plugins
kdelibs4c2a
libart-2.0-2
libaudio2
libc6
libfontconfig1
libfreetype6
libgcc1
libgl1-mesa-glx
libglib2.0-0
libgpod2
libice6
libidn11
libifp4
libjpeg62
libmtp6
libmysqlclient15off
libnjb5
libpng12-0
libpq5
libqt3-mt
libruby1.8
libsdl1.2debian
libsm6
libstdc++6
libtag1c2a
libtunepimp5
libusb-0.1-4
libvisual-0.4-0
libx11-6
libxcursor1
libxext6
libxft2
libxi6
libxinerama1
libxrandr2
libxrender1
libxt6
zlib1g
libvisual-0.4-plugins
konqueror
libqt0-ruby1.8
amarok-engines
libxine1-ffmpeg
kdemultimedia-kio-plugins
kapture::PkgSystem::CreatePM()
kapture::DPkgPM::Go ()
DPkgPM::Go()
DPkgPM::runScripts ('DPkg::Pre-Invoke', 0)
DPkgPM::runScripts ('DPkg::Pre-Install-Pkgs', 1)
adept::DPkgPM::forkScript("/usr/sbin/dpkg-preconfigure --apt || true")
QObject::connect: No such signal konsolePart::processExited(const KProcess*)
QObject::connect: (sender name: 'konsolepart')
QObject::connect: (receiver name: 'unnamed')
kdecore (KProcess): WARNING: _attachPty() 33
a process exited!
END: adept::DPkgPM::forkScript("/usr/sbin/dpkg-preconfigure --apt || true")
DPkgPM::setupArgs ()
reading end of the pipe: 10
running '/usr/bin/dpkg --status-fd 32 --configure debconf '
adept::DPkgPM::forkDpkg ()
QObject::connect: No such signal konsolePart::processExited(const KProcess*)
QObject::connect: (sender name: 'konsolepart')
QObject::connect: (receiver name: 'unnamed')
kdecore (KProcess): WARNING: _attachPty() 33
updateStatus( debconf, half-configured, )
updateStatus: msg =
updateStatus: seen = 1, total = 6460
QString::arg(): Argument missing: , debconf
a process exited!
a process exited!
gpg: Signature made Fri 12 Oct 2007 02:35:28 PM PDT using DSA key ID 437D05B5
gpg: Good signature from "Ubuntu Archive Automatic Signing Key <email address hidden>"
gpg: WARNING: This key is not certified with a trusted signature!
gpg: There is no indication that the signature belongs to the owner.
Primary key fingerprint: 6302 39CC 130E 1A7F D81A 27B1 4097 6EAF 437D 05B5
adept_manager: no process killed
Terminated
fjs@pc1:~$ updateStatus: Reading cache
subprocess pre-installation script killed by signal (Segmentation fault), core dumped