$ snapcraft Preparing to pull juju Pulling juju From https://github.com/juju/juju * tag juju-2.0.2 -> FETCH_HEAD fatal: update_ref failed for ref 'HEAD': cannot update the ref 'HEAD': Trying to write non-commit object 6f9a7321d050cc4318d009330854c781e027a7cb to branch refs/heads/master Command '['git', '-C', '/home/nskaggs/projects/juju/classic-juju-snap/parts/juju/src', 'pull', '--recurse-submodules=yes', 'https://github.com/juju/juju.git', 'refs/tags/juju-2.0.2']' returned non-zero exit status 128 My part for this snapcraft.yaml looks like this: parts: juju: plugin: godeps go-importpath: github.com/juju/juju source: https://github.com/juju/juju.git source-type: git build-packages: [gcc] source-tag: juju-2.0.2 I will note the source is pulled and is correct in the parts directory. However, snapcraft fails per above.