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Calibre was not opening on the KDE menu.
On the command line, I get the following output:

$ calibre
Traceback (most recent call last):
File "/usr/bin/calibre", line 20, in <module>
sys.exit(calibre())
File "/usr/lib/calibre/calibre/gui_launch.py", line 73, in calibre
main(args)
File "/usr/lib/calibre/calibre/gui2/main.py", line 509, in main
app, opts, args = init_qt(args)
File "/usr/lib/calibre/calibre/gui2/main.py", line 122, in init_qt
app = Application(args, override_program_name=override, windows_app_uid=MAIN_APP_UID)
File "/usr/lib/calibre/calibre/gui2/__init__.py", line 885, in __init__
from calibre_extensions import progress_indicator
ImportError: /usr/lib/calibre/calibre/plugins/progress_indicator.so: undefined symbol: _Py_FatalErrorFunc


How can I resolve this?