First, freeCAD is great and has come a long way in the last few years, nice work!
Currently with Ubuntu 20.04 after doing a:
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add-apt-repository ppa:freecad-maintainers/freecad-stable
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apt update
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# apt update
...
Ign:6 http://ppa.launchpad.net/freecad-maintainers/freecad-stable/ubuntu focal InRelease
...
Err:8 http://ppa.launchpad.net/freecad-maintainers/freecad-stable/ubuntu focal Release
404 Not Found [IP: 2001:67c:1560:8008::15 80]
Reading package lists... Done
E: The repository 'http://ppa.launchpad.net/freecad-maintainers/freecad-stable/ubuntu focal Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
thanks,
Paul