add all necessary python packages to stage-packages

snap/snapcraft.yaml

@@ -67,7 +67,18 @@ parts:
       - -lib/python3.8/site-packages/augeas.py # maybe unnecessary
     stage-packages:
       - libaugeas0
-      - python3
+      # added to stage python:
+      - libpython3-stdlib
+      - libpython3.8-stdlib
+      - libpython3.8-minimal
+      - python3-pip
+      - python3-setuptools
+      - python3-wheel
+      - python3-venv
+      - python3-minimal
+      - python3-distutils
+      - python3-pkg-resources
+      - python3.8-minimal
     # To build cryptography and cffi if needed
     build-packages: [libffi-dev, libssl-dev, git]
     override-pull: |