the message you got might have something to do with needing admin rights to edit. i edited on windows machine and had no issue but perhaps on linux you need to edit while root. i do not know it just when you mention "no access" to a file that can mean opening editor via "sudo" maybe?
@Anthony-Kelly You might try unplugging the omega from the dock and putting a small piece of jumper wire between the receive and transmit connectors of the connector the omega sits in (just be careful to get those and not power lines - a 1k resistor would work too, and be more tolerant of mistakes).
With the wire in place whatever you type in a serial terminal should echo back, without it the echo should stop. That would test the USB-serial distinctly from the Omega 2.
@Brad-Buskey Right now, Your showweather program is the only project I have loaded. It sure works great! I don't know about you being a newie. Not in my book. Want to add GPS, but not until I get hotspot working. I thought I did, but soon as I shut off radio in radio in router, blank screen on display. Looks like Omega2 will only send data to wireless router. Tried many other fixes. No good. A reason I want hotspot mode is to demo the project at another location like a school. BTW the Moto-G hotspot mode works fine with my Android tablet. Can't find any reference to this subject in the Community. (Except yours) Probably not really mainstream. I guess I'll just wait.
So, has there been any movement on getting the expled to actually work? I can use the gpioctl but those are on/off, cannot control the amount of color to come through. All that comes back is "Segmentation Fault".