/usr/share/pyshared/allmydata/immutable/ is in tahoe-lafs 1.9.2-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/pyshared/allmydata/immutable/__init__.py
/usr/share/pyshared/allmydata/immutable/checker.py
/usr/share/pyshared/allmydata/immutable/downloader/
/usr/share/pyshared/allmydata/immutable/downloader/__init__.py
/usr/share/pyshared/allmydata/immutable/downloader/common.py
/usr/share/pyshared/allmydata/immutable/downloader/fetcher.py
/usr/share/pyshared/allmydata/immutable/downloader/finder.py
/usr/share/pyshared/allmydata/immutable/downloader/node.py
/usr/share/pyshared/allmydata/immutable/downloader/segmentation.py
/usr/share/pyshared/allmydata/immutable/downloader/share.py
/usr/share/pyshared/allmydata/immutable/downloader/status.py
/usr/share/pyshared/allmydata/immutable/encode.py
/usr/share/pyshared/allmydata/immutable/filenode.py
/usr/share/pyshared/allmydata/immutable/layout.py
/usr/share/pyshared/allmydata/immutable/literal.py
/usr/share/pyshared/allmydata/immutable/offloaded.py
/usr/share/pyshared/allmydata/immutable/repairer.py
/usr/share/pyshared/allmydata/immutable/upload.py