It appears to me to be happening because gobject-introspection only
ships a python file for python3.8 not python3.7 which is the default in
focal.

$ python3.7 /usr/bin/g-ir-scanner
Traceback (most recent call last):
  File "/usr/bin/g-ir-scanner", line 99, in <module>
    from giscanner.scannermain import scanner_main
  File 
"/usr/lib/x86_64-linux-gnu/gobject-introspection/giscanner/scannermain.py", 
line 35, in <module>
    from giscanner.ast import Include, Namespace
  File "/usr/lib/x86_64-linux-gnu/gobject-introspection/giscanner/ast.py", line 
29, in <module>
    from .sourcescanner import CTYPE_TYPEDEF, CSYMBOL_TYPE_TYPEDEF
  File 
"/usr/lib/x86_64-linux-gnu/gobject-introspection/giscanner/sourcescanner.py", 
line 33, in <module>
    from giscanner._giscanner import SourceScanner as CSourceScanner
ModuleNotFoundError: No module named 'giscanner._giscanner'

$ python3.8 /usr/bin/g-ir-scanner
ERROR: Need at least one filename

$ ls -alh /usr/bin/python3
lrwxrwxrwx 1 root root 9 Oct 18 10:23 /usr/bin/python3 -> python3.7


** Also affects: python3-defaults (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1861556

Title:
  g-ir-scanner doesn't work

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