When trying to start Calibre 2.12.0-1.fc21, the following traceback is printed:

Actual results:
The following traceback gets printed:
Traceback (most recent call last):
  File "/usr/bin/calibre", line 20, in <module>
    sys.exit(calibre())
  File "/usr/lib64/calibre/calibre/gui_launch.py", line 47, in calibre
    main(args)
  File "/usr/lib64/calibre/calibre/gui2/main.py", line 473, in main
    gui_debug=gui_debug)
  File "/usr/lib64/calibre/calibre/gui2/main.py", line 335, in run_gui
    from calibre.gui2.ui import Main
  File "/usr/lib64/calibre/calibre/gui2/ui.py", line 40, in <module>
    from calibre.gui2.init import LibraryViewMixin, LayoutMixin
  File "/usr/lib64/calibre/calibre/gui2/init.py", line 17, in <module>
    from calibre.gui2.library.views import BooksView, DeviceBooksView
  File "/usr/lib64/calibre/calibre/gui2/library/views.py", line 17, in <module>
    from calibre.gui2.library.delegates import (RatingDelegate, PubDateDelegate,
  File "/usr/lib64/calibre/calibre/gui2/library/delegates.py", line 22, in <module>
    from calibre.gui2.dialogs.comments_dialog import CommentsDialog
  File "/usr/lib64/calibre/calibre/gui2/dialogs/comments_dialog.py", line 8, in <module>
    from calibre.gui2.dialogs.comments_dialog_ui import Ui_CommentsDialog
  File "/usr/lib64/calibre/calibre/gui2/dialogs/comments_dialog_ui.py", line 41, in <module>
    from calibre.gui2.comments_editor import Editor
  File "/usr/lib64/calibre/calibre/gui2/comments_editor.py", line 17, in <module>
    from PyQt5.QtWebKitWidgets import QWebView, QWebPage
ImportError: libQt5Sensors.so.5: nie można otworzyć pliku obiektu dzielonego: Nie ma takiego pliku ani katalogu

(that means: “no such file or directory”).

PyQt is installed, “import PyQt5” from the Python console works.