Looks like the package got corrupted on your hard drive during download.
I'd suggest running sudo apt-get clean and re-upgrading.
** Changed in: qt4-x11 (Ubuntu)
Status: New => Invalid
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package libqtcore4 (not installed) failed to install/upgrade: nicht vollständig
gelesen in buffer_copy (Backend dpkg-deb während »./usr/lib/libQtCore.so.4.6.2«)
https://bugs.launchpad.net/bugs/618622
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