Re: Precise Pangolin 12.04 LTS or Quantal Quetzal 12.10?
12.04 might be a little more stable because it has been made more conservatively, but unless you are having trouble with 12.10 there is no need to downgrade.
12.04 is supported for 5 years, for businesses using Ubuntu. Individuals usually prefer to stick with the latest release, which is not "beta" but just a little more experimental as it will only be supported for 18 months. The longer support time for LTS is for businesses. You, as a regular user, would not want to stay on 12.04 for five years as everything would be old and crusty by that point.
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.