Comment 7 for bug 668802

$ calibre
Traceback (most recent call last):
  File "/usr/bin/calibre", line 19, in <module>
    sys.exit(main())
  File "/usr/lib/calibre/calibre/gui2/main.py", line 321, in main
    app, opts, args, actions = init_qt(args)
  File "/usr/lib/calibre/calibre/gui2/main.py", line 40, in init_qt
    from calibre.gui2.ui import Main
  File "/usr/lib/calibre/calibre/gui2/ui.py", line 31, in <module>
    from calibre.gui2.widgets import ProgressIndicator
  File "/usr/lib/calibre/calibre/gui2/widgets.py", line 26, in <module>
    from calibre.gui2.progress_indicator import ProgressIndicator as _ProgressIndicator
  File "/usr/lib/calibre/calibre/gui2/progress_indicator/__init__.py", line 15, in <module>
    pi_error)
RuntimeError: Failed to load the Progress Indicator plugin: the sip module implements API v8.0 but the progress_indicator module requires API v7.1

$ lsb_release -r
Release: 10.10