Nothing wrong with dupeGuru itself. This is a Linux permissions issue.
The jlesage/dupeguru container does not run as root by default, so it can read files but cannot delete them if the mounted drive is owned by a different user (very common on ZimaOS).
Fix (recommended):
Edit the container and add these environment variables:
PUID=0
PGID=0
Then restart the container.
ZimaOS storage paths are typically owned by root, so this aligns permissions and allows dupeGuru to delete duplicates correctly.
No reinstall, no extra volumes, no privileged mode needed.
That should resolve it cleanly