Comment 24 for bug 1903378

kde_ui.py fails to load due to this error:
Ubiquity 21.04.1
Traceback (most recent call last):
  File "/usr/lib/ubiquity/bin/ubiquity", line 667, in <module>
    main(oem_config)
  File "/usr/lib/ubiquity/bin/ubiquity", line 653, in main
    install(query=options.query)
  File "/usr/lib/ubiquity/bin/ubiquity", line 253, in install
    ui = importlib.import_module('ubiquity.frontend.%s' % f)
  File "/usr/lib/python3.8/importlib/__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1014, in _gcd_import
  File "<frozen importlib._bootstrap>", line 991, in _find_and_load
  File "<frozen importlib._bootstrap>", line 975, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 671, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 783, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/usr/lib/ubiquity/ubiquity/frontend/kde_ui.py", line 40, in <module>
    import sip
ModuleNotFoundError: No module named 'sip'