[PyQt] Designer-qt5 Crash with custom widget

[Vincent Vande Vyvre]

Hi,

I try to use my custom widgets with the Qt5 designer but the designer 
crash at launching.

With the simplified examples joined and installed installed here:

.../qt5/plugins/designer/libpyqt5.so
                          python/
                                 lineeditplugin.py
                                 widgets/__init__.py
                                         lineedit.py

--------------------------------------------------------------------------------------------------
$ designer-qt5
ImportError: 
/usr/lib/python3/dist-packages/sip.cpython-34m-x86_64-linux-gnu.so: 
undefined symbol: PyExc_SystemError
Error in sys.excepthook:
Traceback (most recent call last):
   File "/usr/lib/python3/dist-packages/apport_python_hook.py", line 63, 
in apport_excepthook
     from apport.fileutils import likely_packaged, get_recent_crashes
   File "/usr/lib/python3/dist-packages/apport/__init__.py", line 5, in 
<module>
     from apport.report import Report
   File "/usr/lib/python3/dist-packages/apport/report.py", line 30, in 
<module>
     import apport.fileutils
   File "/usr/lib/python3/dist-packages/apport/fileutils.py", line 23, 
in <module>
     from apport.packaging_impl import impl as packaging
   File "/usr/lib/python3/dist-packages/apport/packaging_impl.py", line 
20, in <module>
     import apt
   File "/usr/lib/python3/dist-packages/apt/__init__.py", line 23, in 
<module>
     import apt_pkg
ImportError: 
/usr/lib/python3/dist-packages/apt_pkg.cpython-34m-x86_64-linux-gnu.so: 
undefined symbol: PyExc_OSError

Original exception was:
ImportError: 
/usr/lib/python3/dist-packages/sip.cpython-34m-x86_64-linux-gnu.so: 
undefined symbol: PyExc_SystemError
libGL error: Couldn't dlopen libudev.so.1 or libudev.so.0, driver 
detection may be broken.
designer-qt5: ../../../../src/loader/loader.c :129 : asserted_dlsym:  
l'assertion « result » a échoué.
Abandon (core dumped)
------------------------------------------------------------------------------------------------

I'm on Ubuntu Trusty 14.04 and with PyQt5 5.2.1

Vincent
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