[Leonatus]

Here it is:

Microsoft Windows [Version 10.0.17763.557]
(c) 2018 Microsoft Corporation. Alle Rechte vorbehalten.

C:\Users\Jürgen>calibre-debug -g
Python function terminated unexpectedly
  'utf8' codec can't decode byte 0xfc in position 10: invalid start byte (Error Code: 1)
Traceback (most recent call last):
  File "site.py", line 101, in main
  File "site.py", line 77, in run_entry_point
  File "site-packages\calibre\__init__.py", line 23, in <module>
  File "site-packages\calibre\startup.py", line 125, in <module>
  File "site-packages\calibre\utils\localization.py", line 215, in set_translators
  File "site-packages\calibre\utils\localization.py", line 88, in get_lang
  File "site-packages\calibre\utils\config_base.py", line 549, in <module>
  File "site-packages\calibre\utils\config_base.py", line 480, in create_global_prefs
  File "ntpath.py", line 311, in expanduser
UnicodeDecodeError: 'utf8' codec can't decode byte 0xfc in position 10: invalid start byte

C:\Users\Jürgen>