Originally Posted by eschwartz
I believe that error is because you need to recompile calibre's binary plugins against the latest version of PyQt.
When that (PyQt) update hit ArchLinux, I had to run `python2 setup.py build --clean && python2 setup.py build`
If this is your distro package, file a bug report -- they should have rebuilt their calibre package after they upgraded PyQt 5.4 ==> 5.5
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