Full log and script attached, however, here is the relevant part: + snapcraftctl build + python3 -m venv /home/ken/workspace/duplicity-main/build/duplicity-1.2.4.dev2/parts/duplicity/install + SNAPCRAFT_PYTHON_VENV_INTERP_PATH=/home/ken/workspace/duplicity-main/build/duplicity-1.2.4.dev2/parts/duplicity/install/bin/python3 + pip install -U pip setuptools wheel Collecting pip Using cached pip-23.1.2-py3-none-any.whl (2.1 MB) Collecting setuptools Using cached setuptools-67.7.2-py3-none-any.whl (1.1 MB) Collecting wheel Using cached wheel-0.40.0-py3-none-any.whl (64 kB) Installing collected packages: pip, setuptools, wheel Attempting uninstall: pip Found existing installation: pip 20.0.2 Uninstalling pip-20.0.2: Successfully uninstalled pip-20.0.2 Attempting uninstall: setuptools Found existing installation: setuptools 45.2.0 Uninstalling setuptools-45.2.0: Successfully uninstalled setuptools-45.2.0 Attempting uninstall: wheel Found existing installation: wheel 0.34.2 Uninstalling wheel-0.34.2: Successfully uninstalled wheel-0.34.2 Successfully installed pip-23.1.2 setuptools-67.7.2 wheel-0.40.0 + pip install -U -r requirements.txt Traceback (most recent call last): File "/home/ken/workspace/duplicity-main/build/duplicity-1.2.4.dev2/parts/duplicity/install/lib/python3.8/site-packages/pkg_resources/__init__.py", line 629, in _build_master ws.require(__requires__) File "/home/ken/workspace/duplicity-main/build/duplicity-1.2.4.dev2/parts/duplicity/install/lib/python3.8/site-packages/pkg_resources/__init__.py", line 966, in require needed = self.resolve(parse_requirements(requirements)) File "/home/ken/workspace/duplicity-main/build/duplicity-1.2.4.dev2/parts/duplicity/install/lib/python3.8/site-packages/pkg_resources/__init__.py", line 827, in resolve dist = self._resolve_dist( File "/home/ken/workspace/duplicity-main/build/duplicity-1.2.4.dev2/parts/duplicity/install/lib/python3.8/site-packages/pkg_resources/__init__.py", line 873, in _resolve_dist raise VersionConflict(dist, req).with_context(dependent_req) pkg_resources.VersionConflict: (pip 23.1.2 (/home/ken/workspace/duplicity-main/build/duplicity-1.2.4.dev2/parts/duplicity/install/lib/python3.8/site-packages), Requirement.parse('pip==20.0.2')) During handling of the above exception, another exception occurred: Traceback (most recent call last): File "/home/ken/workspace/duplicity-main/build/duplicity-1.2.4.dev2/parts/duplicity/install/usr/bin/pip", line 6, in <module> from pkg_resources import load_entry_point File "/home/ken/workspace/duplicity-main/build/duplicity-1.2.4.dev2/parts/duplicity/install/lib/python3.8/site-packages/pkg_resources/__init__.py", line 3327, in <module> def _initialize_master_working_set(): File "/home/ken/workspace/duplicity-main/build/duplicity-1.2.4.dev2/parts/duplicity/install/lib/python3.8/site-packages/pkg_resources/__init__.py", line 3301, in _call_aside f(*args, **kwargs) File "/home/ken/workspace/duplicity-main/build/duplicity-1.2.4.dev2/parts/duplicity/install/lib/python3.8/site-packages/pkg_resources/__init__.py", line 3339, in _initialize_master_working_set working_set = WorkingSet._build_master() File "/home/ken/workspace/duplicity-main/build/duplicity-1.2.4.dev2/parts/duplicity/install/lib/python3.8/site-packages/pkg_resources/__init__.py", line 631, in _build_master return cls._build_from_requirements(__requires__) File "/home/ken/workspace/duplicity-main/build/duplicity-1.2.4.dev2/parts/duplicity/install/lib/python3.8/site-packages/pkg_resources/__init__.py", line 644, in _build_from_requirements dists = ws.resolve(reqs, Environment()) File "/home/ken/workspace/duplicity-main/build/duplicity-1.2.4.dev2/parts/duplicity/install/lib/python3.8/site-packages/pkg_resources/__init__.py", line 827, in resolve dist = self._resolve_dist( File "/home/ken/workspace/duplicity-main/build/duplicity-1.2.4.dev2/parts/duplicity/install/lib/python3.8/site-packages/pkg_resources/__init__.py", line 868, in _resolve_dist raise DistributionNotFound(req, requirers) pkg_resources.DistributionNotFound: The 'pip==20.0.2' distribution was not found and is required by the application Failed to build 'duplicity'. It tries to upgrade to the newest version in the venv, then fails because pkg-resources installed from apt wants the ancient version it uses.