RuntimeError: qgis._gui cannot import type '����' from PyQt5.QtCore with QGIS 3.10.2 and Ubuntu 18.04

[stragu]

Using Ubuntu Studio 18.04 with the ubuntugis repos, when I start QGIS 3.10.2, I run into this issue:

Couldn't load PyQGIS.
Python support will be disabled.


Traceback (most recent call last):
  File "", line 1, in 
  File "/usr/lib/python3/dist-packages/qgis/gui/__init__.py", line 25, in 
    from qgis._gui import *
RuntimeError: qgis._gui cannot import type '����' from PyQt5.QtCore


Python version:
3.6.9 (default, Nov  7 2019, 10:44:02) 
[GCC 8.3.0]

QGIS version:
3.10.2-A Coruña 'A Coruña', 616ad4531b

Python path:
['/usr/share/qgis/python', '/home/stragu/.local/share/QGIS/QGIS3/profiles/default/python', '/home/stragu/.local/share/QGIS/QGIS3/profiles/default/python/plugins', '/usr/share/qgis/python/plugins', '/usr/lib/python36.zip', '/usr/lib/python3.6', '/usr/lib/python3.6/lib-dynload', '/home/stragu/.local/lib/python3.6/site-packages', '/home/stragu/software/reaper/src/socialreaper', '/usr/local/lib/python3.6/dist-packages', '/usr/lib/python3/dist-packages', '/usr/lib/python3.6/dist-packages']

Which results in QGIS without most of the processing tools.

I could find my Qt5 and PyQt5 version by running the following:

python3
from PyQt5.QtCore import QT_VERSION_STR
print("Qt version:", QT_VERSION_STR)
from PyQt5.Qt import PYQT_VERSION_STR
print("PyQt version:", PYQT_VERSION_STR)

I had 5.9.2 for the Qt version, and 5.9.1 for the PyQt version.

I also checked my version of libqt5core5a, and I had 5.9.5 installed.

So I thought I could try updating PyQt5 incrementally and see if that helped. You can check the history of releases of PyQt5 here: https://pypi.org/project/PyQt5/#history

I first tried:

pip3 install 'pyqt5==5.10.1'

But that led to more issues, as PyQt5 was obviously looking for Qt Core version 5.10 on my system. Upgrading Qt on the system seems like a bad, painful idea, so I decided to revert PyQt5 to the previous version. Turns out there was a more recent release in the 5.9 branch: I had 5.9.1 installed, but there is 5.9.2 available. I ran:

pip3 install 'pyqt5==5.9.2'

... to no avail, unfortunately. Back to the original issue.

_{(Also, sidenote: pip3 makes it looks like it sticks to the 5.10 branch. The commands:}

pip3 list

_and

pip3 list --user

_{... show that both the system and user modules have PyQt5 5.10.1}

_{But going into a python3 kernel again, we can confirm that the version matches whatever we installed last. Phew, just a pip3 weirdness?)}

Interestingly (?), the bionic repos have version 5.10.1 of pyqt5-dev available, which is not installed by default, but installing it doesn't change anything.

People having similar issues online:

• Someone using Neon (and QGIS 3.4) managed to make a copy of the PyQt5 folder from a vanilla Ubuntu 18.04.1 and replaced the Neon one. I haven't tried that just yet, as it seems like a pretty heavy workaround, but here is the report: PyCapsule_GetPointer called with incorrect name #28362
• Someone has the same error (using Anaconda, Ubuntu 18.04 and QGIS 3.10), trying to use pyqgis in Spyder: https://gis.stackexchange.com/questions/315204/cannot-import-qgis-gui-into-spyder
• Someone also reported this with Ubuntu 18.04 and QGIS 3.4, and fixed it with a simple remove and install of main packages, but that didn't work for me either: Python error on QGIS GUI startup #28263

I'm out of ideas here. Anything else I could try?

QGIS and OS versions

QGIS version	3.10.2-A Coruña	QGIS code revision	616ad45
Compiled against Qt	5.9.5	Running against Qt	5.9.5
Compiled against GDAL/OGR	3.0.2	Running against GDAL/OGR	3.0.2
Compiled against GEOS	3.8.0-CAPI-1.13.1	Running against GEOS	3.8.0-CAPI-1.13.1
Compiled against SQLite	3.22.0	Running against SQLite	3.22.0
PostgreSQL Client Version	10.10 (Ubuntu 10.10-0ubuntu0.18.04.1)	SpatiaLite Version	4.3.0a
QWT Version	6.1.3	QScintilla2 Version	2.10.2
Compiled against PROJ	6.2.1	Running against PROJ	Rel. 6.2.1, November 1st, 2019
OS Version	Ubuntu 18.04.4 LTS

[gioman]

with the ubuntugis repos

@stragu did you added the proper qgis.org repo (that uses ubuntugis dependencies)?

[stragu]

Yes, using https://qgis.org/ubuntugis/ Stéphane Guillou

…

On 6 Feb 2020, at 05:31, Giovanni Manghi ***@***.***> wrote:  with the ubuntugis repos @stragu did you added the proper qgis.org repo (that uses ubuntugis dependencies)? — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub, or unsubscribe.

[gioman]

Yes, using https://qgis.org/ubuntugis/

@stragu weird, many of us do installations on k/ubuntu, mint at al. and I personally don't see this problem/error. It could be a local issue, you can test it by trying the installation on Ubuntu Studio on VM for example.

[stragu]

Thanks, @gioman

After paying around with my PyQt5 version, I've got the following error:

Traceback (most recent call last):
  File "", line 1, in 
  File "/usr/lib/python3/dist-packages/qgis/core/__init__.py", line 25, in 
    from qgis._core import *
ValueError: PyCapsule_GetPointer called with incorrect name

Which makes me think it has to be something like this one: #28362
(they witnessed the same two errors).

[stragu]

Hm interesting, I think I solved it by uninstalling PyQt5 and PyQt5-sip with pip3, I guess so QGIS would use my system packages instead?

I did the following in a terminal:

pip3 uninstall PyQt5-sip
pip3 uninstall PyQt5

And I can now start QGIS 3.10 without errors!

This is where I got the idea: https://tutel.me/c/gis/questions/306595/qgis+34+couldn39t+load+sip+module+python+support+will+be+disabled+on+windows+10

Does that make sense to you at all?

[nyalldawson]

In general it's a really bad idea to install pyqt through pip -- you'll end up with a mess of conflicting qt versions on your system

[stragu]

Thank you, not sure how I started out with those installed through Pip, but glad it's working now.

Thanks again for your help, @nyalldawson and @gioman ! :)

[jmonticolo]

RuntimeError: qgis._gui cannot import type '����' from PyQt5.QtCore

For this error, I've just reinstalled PyQt5 QScintilla :

sudo apt reinstall python3-pyqt5.qsci

[rhabacker]

With qgis 3.32.0 on openSUSE Tumbleweed I also fixed this issue by installing PyQt5 QScintilla

sudo zypper install  python311-qscintilla-qt5 

[XianranZ]

Hm interesting, I think I solved it by uninstalling PyQt5 and PyQt5-sip with pip3, I guess so QGIS would use my system packages instead?

I did the following in a terminal:

pip3 uninstall PyQt5-sip
pip3 uninstall PyQt5

And I can now start QGIS 3.10 without errors!

This is where I got the idea: https://tutel.me/c/gis/questions/306595/qgis+34+couldn39t+load+sip+module+python+support+will+be+disabled+on+windows+10

Does that make sense to you at all?

I have the same error with you. After I uninstalled pyqt5 and pyqt5-sip, i got the error ' no module named pyqt5.core'. How can I solve it? Do you have any idea?

[XianranZ]

Os: redhat7.6
qgis: 3.28.14
QT: 5.14.2
PYQT: 5.14.2

[Gwing97]

Hm interesting, I think I solved it by uninstalling PyQt5 and PyQt5-sip with pip3, I guess so QGIS would use my system packages instead?
I did the following in a terminal:

pip3 uninstall PyQt5-sip
pip3 uninstall PyQt5

And I can now start QGIS 3.10 without errors!
This is where I got the idea: https://tutel.me/c/gis/questions/306595/qgis+34+couldn39t+load+sip+module+python+support+will+be+disabled+on+windows+10
Does that make sense to you at all?

I have the same error with you. After I uninstalled pyqt5 and pyqt5-sip, i got the error ' no module named pyqt5.core'. How can I solve it? Do you have any idea?

Me too. I have same problem. But don't know how to do.

[XianranZ]

Hm interesting, I think I solved it by uninstalling PyQt5 and PyQt5-sip with pip3, I guess so QGIS would use my system packages instead?
I did the following in a terminal:

pip3 uninstall PyQt5-sip
pip3 uninstall PyQt5

And I can now start QGIS 3.10 without errors!
This is where I got the idea: https://tutel.me/c/gis/questions/306595/qgis+34+couldn39t+load+sip+module+python+support+will+be+disabled+on+windows+10
Does that make sense to you at all?

I have the same error with you. After I uninstalled pyqt5 and pyqt5-sip, i got the error ' no module named pyqt5.core'. How can I solve it? Do you have any idea?

Me too. I have same problem. But don't know how to do.

I reinstalled qgis and all it's dependencies on a new machine and then the problem was solved. I don't know if this will solve your problem, but I hope my answer will help you.