Comment 1 for bug 1464984

The error code 8 comes from the "TFTP Option Extension" RFC https://tools.ietf.org/html/rfc2347. This is an error code that isn't supported by python-tx-tftp, hence the crash. This has been fixed upstream https://github.com/shylent/python-tx-tftp/pull/20 but the patch didn't make it into the packaged version of python-tx-tftp. We should get the fix included in the package but something we can do in the meantime is have monkey patch the tftp code (the patch seems trivial enough).