Traceback (most recent call last):
  File "/usr/share/software-center/expunge-cache.py", line 85, in <module>
    cleaner.clean()
  File "/usr/share/software-center/expunge-cache.py", line 43, in clean
    self._rm(fullpath)
  File "/usr/share/software-center/expunge-cache.py", line 28, in _rm
    os.unlink(f)
OSError: [Errno 2] No such file or directory: '/home/username/.cache/software-center/piston-helper/rec.ubuntu.com,api,1.0,recommend_app,gimp-openraster,,4f28efd8092478f12f0c179896b50ff5'