Staging the apt package lsb-release in python part make the build of the part fail with the following message: Pulling my-part + snapcraftctl pull Building my-part + snapcraftctl build + python3 -m venv /root/parts/my-part/install Error: Command '['/root/parts/my-part/install/bin/python3', '-Im', 'ensurepip', '--upgrade', '--default-pip']' returned non-zero exit status 1. Failed to build 'my-part'. The snapcraft.yaml is: name: my-snap-name base: core20 version: '0.1' summary: text description: | more text grade: devel # must be 'stable' to release into candidate/stable channels confinement: devmode # use 'strict' once you have the right plugs and slots parts: my-part: plugin: python python-packages: [numpy] stage-packages: [lsb-release] apps: my-snap-name: command: bin/python3 Calling snapcraft over it causes the issue. Removing ${SNAPCRAFT_PART_INSTALL}/bin from the PATH seems to solve the issue, but this is hardcoded in the plugin