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_co
** Attachment added: "AptOrdering.txt"
https://bugs.launchpad.net/bugs/618622/+attachment/1493103/+files/AptOrdering.txt
** Attachment added: "Df.txt"
https://bugs.launchpad.net/bugs/618622/+attachment/1493104/+files/Df.txt
** Attachment added: "Dmesg.txt"
https://bugs.launchpad.net/bu