Traceback (most recent call last):
  File "/usr/bin/gdebi-gtk", line 67, in <module>
    app = GDebi(datadir=data,options=options,file=afile)
  File "/usr/lib/python2.6/dist-packages/GDebi/GDebi.py", line 118, in __init__
    self.open(file)
  File "/usr/lib/python2.6/dist-packages/GDebi/GDebi.py", line 217, in open
    for name in self._deb.control_filelist:
  File "/usr/lib/python2.6/dist-packages/GDebi/DebPackage.py", line 438, in control_filelist
    for name in DebFile(self.file).control:
  File "/usr/lib/pymodules/python2.6/debian_bundle/debfile.py", line 234, in __init__
    compressed_part_name(DATA_PART)))
  File "/usr/lib/pymodules/python2.6/debian_bundle/debfile.py", line 219, in compressed_part_name
    " (expected one of: %s)" % candidates)
DebError: missing required part in given .deb (expected one of: ['data.tar.gz', 'data.tar.bz2'])