error while loading shared libraries: libQtSql.so.4: cannot open shared object file: No such file or directory

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http://askubuntu.com – A similar issue is found elsewhere but only with 32bit programs. I have this problem when trying to run clementine - which is 64bit, i checked the binary i have - and ubuntu-one-control-panel-qt I'm starting to feel like I've tried everything. Is there a way to restore my qt installation to some kind of default state? I think this might have happened after I uninstalled Rhythmbox with 'sudo apt-get remove rhythmbox'. I've since reinstalled rhythmbox though, and thought any removed dependencies would be reinstalled with apt.... (HowTos)