That might be another gtk-qt-engine bug, are you sure that's the icon theme and not the GTK theme being the problem? How do you select the "Kubuntu human" theme? What package did you install to have it available?
** Changed in: gnome-desktop (Ubuntu) Importance: Undecided => Medium Assignee: (unassigned) => Ubuntu Desktop Bugs -- Trying to use KDE icon theme in Gnome makes him unstartable https://launchpad.net/bugs/62657 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs