Traceback (most recent call last):
  File "/usr/share/hplip/ui4/plugindialog.py", line 249, in NextButton_clicked
    self.plugin_download_callback)
  File "/usr/share/hplip/installer/core_install.py", line 1851, in get_plugin_info
    filename, headers = urllib.urlretrieve(plugin_conf_url, local_conf, callback)
  File "/usr/lib/python2.7/urllib.py", line 91, in urlretrieve
    return _urlopener.retrieve(url, filename, reporthook, data)
  File "/usr/lib/python2.7/urllib.py", line 262, in retrieve
    size = int(headers["Content-Length"])
ValueError: invalid literal for int() with base 10: '7332, 7332'