apt> remove libqt4-core 
Unrequested changes are needed to execute this operation.
The following packages will be REMOVED:
  fbreader focuswriter keepassx libphonon libqt4-core libqt4-dbus libqt4-gui libqt4-network libqt4-opengl libqt4-xml minitube phonon-vlc qnetwalk screengrab skype
  synkron virtualbox vlc vlc-interface-qt4
0 upgraded, 0 newly installed, 19 removed and 0 kept.
Will need more 0B of archives.
After unpacking 91.9MB disk space will be freed.
Do you want to continue? [Y/n]