Comment 8 for bug 967332

I still see this after updating to raring.

The hidden .nfs temporary files in the /home/username/.cache/software-center/software-center-agent.db directory are held open by the process
/usr/lib/x86_64-linux-gnu/unity-lens-applications/unity-applications-daemon

That is why they have not disappeared.
http://stackoverflow.com/questions/11228079/python-remove-directory-error-file-exists

So why is unity-applications-daemon holding these files open? Is it sensible for update-software-center-agent to be trying to remove the directory when something else can be keeping the files in it open?