Hi conor100
As far as I know the softwareSerial library is not implemented yet, take a look at this post https://communities.intel.com/thread/47898 . Regarding the Sensor I've seen a couple of CO sensors that have an analog output, but I don’t know any CO2 sensor, if I find one that might work for the Galileo I’ll post it here.
Regards,
JPMontero_Intel