<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _change_secure_boot_settings(self, property, value):
 """Change secure boot settings on the server."""

        system = self._get_host_details()
        # find the BIOS URI
        if ('links' not in system['Oem']['Hp'] or
           'SecureBoot' not in system['Oem']['Hp']['links']):
            msg = (' "SecureBoot" resource or feature is not '
                   'supported on this system')
            raise exception.IloCommandNotSupportedError(msg)

        secure_boot_uri = system['Oem']['Hp']['links']['SecureBoot']['href']

        # Change the property required
        new_secure_boot_settings = {}
        new_secure_boot_settings[property] = value

        # perform the patch
        status, headers, response = self._rest_patch(
            secure_boot_uri, None, new_secure_boot_settings)

        if status >= 300:
            msg = self._get_extended_error(response)
            raise exception.IloError(msg)

        # Change the bios setting as a workaround to enable secure boot
        # Can be removed when fixed for Gen9 snap2
        val = self._get_bios_setting('CustomPostMessage')
        val = val.rstrip() if val.endswith(" ") else val+" "
        self._change_bios_setting({'CustomPostMessage': val})