It looks like the package file got corrupted during download. Try
running sudo apt-get clean and then re-upgrading.
** Changed in: qt4-x11 (Ubuntu)
Status: New => Invalid
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package libqtgui4 (not installed) failed to install/upgrade: subprocess
dpkg-deb --fsys-tarfile returned error exit status 2
https://bugs.launchpad.net/bugs/518287
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