Hello I just realized that libQtNetwork.so.4: is part of libqt4-network So I tried to remove this package but then I am told that 154 package will be removed, which I refused. Now when I tried Sudo apt-get install (it is already installed) then instead of uprading apt-get offers me to install 20 addional packages libphonon4 libqt4-assistant libqt4-dbus libqt4-designer libqt4-help libqt4-opengl libqt4-qt3support libqt4-script libqt4-scripttools libqt4-sql libqt4-sql-mysql libqt4-sql-sqlite libqt4-svg libqt4-test libqt4-webkit libqt4-xml libqt4-xmlpatterns libqtcore4 libqtgui4 I am really puzzled.