the following packages won't upgrade throught "sudo apt -t jessie-backports upgrade" :
apparmor libqt4-dbus libqt4-dbus:i386 libqt4-declarative libqt4-declarative-folderlistmodel libqt4-declarative-gestures
libqt4-declarative-particles libqt4-declarative-shaders libqt4-designer libqt4-dev libqt4-dev-bin libqt4-help libqt4-network
libqt4-network:i386 libqt4-opengl libqt4-opengl:i386 libqt4-qt3support libqt4-script libqt4-scripttools libqt4-sql
libqt4-sql-mysql libqt4-sql-sqlite libqt4-svg libqt4-test libqt4-xml libqt4-xml:i386 libqt4-xmlpatterns
libqt4-xmlpatterns:i386 libqt5clucene5 libqt5concurrent5 libqt5core5a libqt5dbus5 libqt5designer5 libqt5designercomponents5
libqt5gui5 libqt5help5 libqt5network5 libqt5opengl5 libqt5printsupport5 libqt5qml5 libqt5quick5 libqt5quicktest5
libqt5quickwidgets5 libqt5script5 libqt5sql5 libqt5sql5-sqlite libqt5svg5 libqt5test5 libqt5webkit5 libqt5widgets5
libqt5x11extras5 libqt5xml5 libqt5xmlpatterns5 libqtcore4 libqtcore4:i386 libqtdbus4 libqtdbus4:i386 libqtgui4
libqtgui4:i386 qdbus qml-module-qtquick-controls qml-module-qtquick-layouts qml-module-qtquick-window2 qml-module-qtquick2
qt4-linguist-tools:i386 qt4-qmake:i386 qt4-qmlviewer qt4-qtconfig qtbase5-dev-tools qtchooser qtdeclarative5-dev-tools
qttools5-dev-tools qtxmlpatterns5-dev-tools
calibre calibre-bin hplip-gui libqt5declarative5 python-pyqt5 python-pyqt5.qtsvg python-pyqt5.qtwebkit python3-pyqt5
qtcreator qtquick1-5-dev-tools