Freecad crashes on startup

[Reuben Firmin]

FreeCAD 0.19, Libs: 0.19R
© Juergen Riegel, Werner Mayer, Yorik van Havre and others 2001-2021
FreeCAD is free and open-source software licensed under the terms of LGPL2+ license.
FreeCAD wouldn't be possible without FreeCAD community.
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Seems the python standard libs are not installed, bailing out!

Traceback (most recent call last):
  File "<string>", line 256, in <module>
  File "/usr/lib/python3.9/datetime.py", line 12, in <module>
    import math as _math
<class 'ModuleNotFoundError'>: No module named 'math'
Traceback (most recent call last):
  File "<string>", line 201, in <module>
  File "<string>", line 117, in InitApplications
<class 'AttributeError'>: module 'FreeCAD' has no attribute '__ModDirs__'
Error in FreeCADGuiInit.py: module 'FreeCAD' has no attribute '__ModDirs__'

ProblemType: Bug
DistroRelease: Ubuntu 21.04
Package: freecad 0.19.1+dfsg1-2
ProcVersionSignature: Ubuntu 5.11.0-38.42-generic 5.11.22
Uname: Linux 5.11.0-38-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu65.3
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: KDE
Date: Thu Oct 21 14:45:51 2021
InstallationDate: Installed on 2021-06-23 (120 days ago)
InstallationMedia: Kubuntu 21.04 "Hirsute Hippo" - Release amd64 (20210420)
PackageArchitecture: all
SourcePackage: freecad
UpgradeStatus: No upgrade log present (probably fresh install)