Re: ubuntu touch and dual sim smartphones. is it possible??
I don't expect the official Ubuntu Phone software will support dual-sim, at least not at the beginning. However I do expect that the underlying software will be written well enough to support both radios, and a phone manufacturer would be able to write a dual-sim dialler and messaging app easily enough. One might even appear in the Ubuntu Software Center.
Don't expect dual-sim Ubuntu Phones in the first year, but after the platform gains traction they may well appear.
I try to treat the cause, not the symptom. I avoid the terminal in instructions, unless it's easier or necessary. My instructions will work within the Ubuntu system, instead of breaking or subverting it. Those are the three guarantees to the helpee.