the traceback that you provided has not link with s-d-a.
The error is in "/usr/bin/pycentral":
File "/usr/bin/pycentral", line 700, in remove
default_runtime.remove_byte_code(self.private_files)
AttributeError: 'NoneType' object has no attribute 'remove_byte_code'-- [apport] service-discovery-applet crashed with KeyError in remove_service() https://launchpad.net/bugs/83116 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
