df23b42a9a
use_2to3 was removed from setuptools with version 58.0.0. There is an upstream issue for this error (https://github.com/indigo-dc/udocker/issues/358) and has been resolved with commit https://github.com/indigo-dc/udocker/commit/9f7d6c5f9a3925bf87d000603c5b306d73bb0fa3. We apply this commit as a patch. Disable test_02__load_structure because it fails with a unittest.mock.InvalidSpecError.