Comment 3 for bug 725186

Here is the traceback generated on Maverick:

Traceback (most recent call last):
  File "/usr/bin/software-center", line 90, in <module>
    app = SoftwareCenterApp(datadir, xapian_base_path, options, args)
  File "/usr/share/software-center/softwarecenter/app.py", line 149, in __init__
    self.history = get_apt_history()
  File "/usr/share/software-center/softwarecenter/apt/apthistory.py", line 178, in get_apt_history
    apt_history = AptHistory()
  File "/usr/share/software-center/softwarecenter/apt/apthistory.py", line 83, in __init__
    self.rescan()
  File "/usr/share/software-center/softwarecenter/apt/apthistory.py", line 98, in rescan
    self._scan(history_gz_file)
  File "/usr/share/software-center/softwarecenter/apt/apthistory.py", line 110, in _scan
    for stanza in deb822.Deb822.iter_paragraphs(f):
  File "/usr/lib/pymodules/python2.6/debian/deb822.py", line 287, in iter_paragraphs
    x = cls(iterable, fields, encoding=encoding)
  File "/usr/lib/pymodules/python2.6/debian/deb822.py", line 255, in __init__
    self._internal_parser(sequence, fields)
  File "/usr/lib/pymodules/python2.6/debian/deb822.py", line 308, in _internal_parser
    for line in self.gpg_stripped_paragraph(sequence):
  File "/usr/lib/pymodules/python2.6/debian/deb822.py", line 551, in gpg_stripped_paragraph
    return cls.split_gpg_and_payload(sequence)[1]
  File "/usr/lib/pymodules/python2.6/debian/deb822.py", line 503, in split_gpg_and_payload
    for line in sequence:
  File "/usr/lib/python2.6/gzip.py", line 438, in next
    line = self.readline()
  File "/usr/lib/python2.6/gzip.py", line 393, in readline
    c = self.read(readsize)
  File "/usr/lib/python2.6/gzip.py", line 219, in read
    self._read(readsize)
  File "/usr/lib/python2.6/gzip.py", line 271, in _read
    uncompress = self.decompress.decompress(buf)
zlib.error: Error -3 while decompressing: invalid distance too far back