[Qgis-user] Couldn't load SIP module. ModuleNotFoundError: No module named 'qgis'

[Frank Heuer]

Hallo qgis users

I need help with the new 3.10 qgis on my ubuntu Ubuntu 18.04.3 LTS
system. When I start qgis, I get an Python-errorbox showing, that the
SIP module could not be loaded. Because I run with german locale I could
only post the german message here, but its nearly the same as in
https://issues.qgis.org/issues/22029. Here is the original:

Das SIP-Modul konnte nicht geladen werden.
Die Python-Unterstützung wird abgeschaltet.

Traceback (most recent call last):
File "", line 1, in
ModuleNotFoundError: No module named 'qgis'

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

QGIS-Version:
3.10.1-A Coruña 'A Coruña', ef24c52
<https://github.com/qgis/QGIS/commit/ef24c526da26a4d3e9c542659e48b32480d0827f>

Python-Pfad:
['/usr/share/qgis/python',
'/home/frank/.local/share/QGIS/QGIS3/profiles/default/python',
'/home/frank/.local/share/QGIS/QGIS3/profiles/default/python/plugins',
'/usr/share/qgis/python/plugins', '/usr/local/lib/python36.zip',
'/usr/local/lib/python3.6', '/usr/local/lib/python3.6/lib-dynload',
'/home/frank/.local/lib/python3.6/site-packages',
'/usr/local/lib/python3.6/site-packages']

How to fix this error? I have no idea where the qgis module is installed
and which search path is the right.

Actual, via update-alternatives --config python I activated python3 in
manual mode

Regards

Frank

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