Comment 2 for bug 1862226

The sed you are referring about is only found in focal:

sssd-2.2.2/debian/rules: sed -i -e 's:/usr/bin/python:/usr/bin/python3:' $(CURDIR)/debian/tmp/usr/sbin/sss_obfuscate

My understanding of "dh_python*" is that it will try to convert python dependencies from a source such as requirements.txt for instance.

If there is no existence of it in the src code (which seems to be the case in sssd) then I don't see how dh_python* can know about it, other than implicitly adding the Depends in d/control.