libQt5XcbQpa.so.5: undefined symbol: _ZN22QWindowSystemInterface24setPlatformFiltersEventsEb

[LaGuiche55]

Hello,

I have installed Qt5 on Ubuntu 20.04 using the online executable and then I have installed PyQt5 and matplotlib and I have the following error using python whenever I import matplotlib.pyplot (importing matplotlib does not generate any error)

Do you know what is creating the issue with libQt5XcbQpa.so.5 ?

Best,
JP

Python 3.8.5 (default, Jul 28 2020, 12:59:40)
Type 'copyright', 'credits' or 'license' for more information
IPython 7.19.0 -- An enhanced Interactive Python. Type '?' for help.
PyDev console: using IPython 7.19.0
Python 3.8.5 (default, Jul 28 2020, 12:59:40)
[GCC 9.3.0] on linux

import matplotlib.pyplot as plt
Backend Qt5Agg is interactive backend. Turning interactive mode on.
/usr/bin/python3.8: symbol lookup error: /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5: undefined symbol: _ZN22QWindowSystemInterface24setPlatformFiltersEventsEb, version Qt_5_PRIVATE_API
Process finished with exit code 127

[jsulm]

@LaGuiche55 said in libQt5XcbQpa.so.5: undefined symbol: _ZN22QWindowSystemInterface24setPlatformFiltersEventsEb:

and then I have installed PyQt5 and matplotlib

How exactly?

[LaGuiche55]

@jsulm Thanks for your answer
I used a simple pip install for python 3.8
pip3 install PyQt5
pip3 install matplotlib

[LaGuiche55]

@LaGuiche55 Following your question, I have uninstalled and reinstalled those components and now it works .
I have uninstalled Qt with ./MaintenanceTool
pip uninstalled PyQt5
pip uninstalled matplotlib
sudo apt-get install qt5-default
Qt install with online install executable
pip install PyQt5
pip install matplotlib

Thanks