Hi all,
Using two commands below, I am unable to purge deleted datasets (from a local instance of galaxy installed on ubuntu). I have deleted some datasets from the history panel and I want to purge only datasets not the history itself.

commands:
1. python scripts/cleanup_datasets/cleanup_datasets.py universe_wsgi.ini -d 0 -6 -r  
2. python scripts/cleanup_datasets/cleanup_datasets.py universe_wsgi.ini -d 0 -3 -r 
results:
Purged 0 datasets
Freed disk space:  0

I can't figure out what's wrong. Maybe a privilege problem or something else?? Any help would be most appreciated.