Re: Ubuntu 12.04 on a Intel P4 machine
Some people replying here... to say it nicely, they probably haven't used 12.04.
You can definitely use Ubuntu 12.04 on a Pentium 4. If the default Unity 3D desktop is a bit slow, you can just log into the 2D version of Unity.
I used Unity 3D on a netbook, which is a lot slower than a P4.
If you want something later than 12.04 you can try 13.04, but if your GPU doesn't have official support you may only get decent performance on Lubuntu (LXDE) because Unity 2D is not available in 12.10 or later.
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.