package libqtgui4 (not installed) failed to install/upgrade: subprocess dpkg-deb --fsys-tarfile returned error exit status 2

[castlan]

ubuntu@ubuntu:~$ lsb_release -rd
Description: Ubuntu 9.10
Release: 9.10

-----------------
ldconfig deferred processing now taking place
Errors were encountered while processing:
 vlc
Reading package lists... Done
Building dependency tree
Reading state information... Done
Reading extended state information
Initializing package states... Done
Writing extended state information... Done

Current status: 1 broken [+1], 214 updates [-1].
ubuntu@ubuntu:~$ lsb_release -rd
Description: Ubuntu 9.10
Release: 9.10
ubuntu@ubuntu:~$ apt-cache policy vlc
vlc:
  Installed: 1.0.2-1ubuntu2.1
  Candidate: 1.0.2-1ubuntu2.1
  Version table:
 *** 1.0.2-1ubuntu2.1 0
        500 http://archive.ubuntu.com karmic-updates/universe Packages
        100 /var/lib/dpkg/status
     1.0.2-1ubuntu2 0
        500 http://archive.ubuntu.com karmic/universe Packages
ubuntu@ubuntu:~$ apt-cache policy qt4-x11
W: Unable to locate package qt4-x11

ProblemType: Package
Architecture: i386
Date: Sun Feb 7 00:52:25 2010
DistroRelease: Ubuntu 9.10
ErrorMessage: subprocess dpkg-deb --fsys-tarfile returned error exit status 2
LiveMediaBuild: Ubuntu 9.10 "Karmic Koala" - Release i386 (20091028.5)
Package: libqtgui4 (not installed)
ProcVersionSignature: Ubuntu 2.6.31-14.48-generic
SourcePackage: qt4-x11
Title: package libqtgui4 (not installed) failed to install/upgrade: subprocess dpkg-deb --fsys-tarfile returned error exit status 2
Uname: Linux 2.6.31-14-generic i686

[Jonathan Thomas (echidnaman)]

It looks like the package file got corrupted during download. Try running sudo apt-get clean and then re-upgrading.