[SOLVED] PyQt5Core 5.15 missing

[AwesomeCronk]

I installed FreeCAD 0.19.2 via the freecad-maintainers/freecad-stable PPA:

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sudo add-apt-repository ppa:freecad-maintainers/freecad-stable
sudo apt update
sudo apt install freecad freecad-doc

Since installing it I have seen error after error in the Report View about unknown commands and various errors. Here is an example (output when I start FreeCAD):

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13:34:11  During initialization the error "/lib/x86_64-linux-gnu/libQt5Core.so.5: version `Qt_5.15' not found (required by /usr/local/lib/python3.8/dist-packages/PyQt5/QtCore.abi3.so)" occurred in /usr/share/freecad/Mod/AddonManager/InitGui.py
13:34:11  Please look into the log file for further information
13:34:11  During initialization the error "/lib/x86_64-linux-gnu/libQt5Core.so.5: version `Qt_5.15' not found (required by /usr/local/lib/python3.8/dist-packages/PyQt5/QtCore.abi3.so)" occurred in /usr/share/freecad/Mod/Tux/InitGui.py
13:34:11  Please look into the log file for further information
13:34:12  During initialization the error "/lib/x86_64-linux-gnu/libQt5Core.so.5: version `Qt_5.15' not found (required by /usr/local/lib/python3.8/dist-packages/PyQt5/QtCore.abi3.so)" occurred in /usr/share/freecad/Mod/Draft/InitGui.py
13:34:12  Please look into the log file for further information
13:34:12  During initialization the error "/lib/x86_64-linux-gnu/libQt5Core.so.5: version `Qt_5.15' not found (required by /usr/local/lib/python3.8/dist-packages/PyQt5/QtCore.abi3.so)" occurred in /usr/share/freecad/Mod/Arch/InitGui.py
13:34:12  Please look into the log file for further information
13:34:14  Unknown command 'Std_AddonMgr'

I have googled and searched the forums for a while now. I found similar issues that were resolved, but none worked for me. This issue prevents me from using the Path workbench. I believe what I need to do is upgrade the Qt version, but I haven't the slightest idea how.

OS: Ubuntu 20.04.3 LTS (ubuntu:GNOME/ubuntu)
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.19.
Build type: Release
Branch: unknown
Hash: 0d9536ed3e8c7f40197b5606e1b7873625e1d6fe
Python version: 3.8.10
Qt version: 5.12.8
Coin version: 4.0.0
OCC version: 7.5.2
Locale: English/United States (en_US)

[AwesomeCronk]

Nearly an hour later, a solution: https://forum.freecadweb.org/viewtopic. ... 4&start=10

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pip uninstall pyqt5
sudo apt install pyqt5-dev-tools python3-pyqt5

This removes the version of Qt5 bundled with the Pip PyQt5 package and installs 5.15 via APT.

[lqfjun88]

I install qt 5.15 with snap

sudo snap install qt515-core20