Re: x32 vs x64 performance question
For ordinary desktop use, you wont notice a speed difference. When you are doing video encoding or certain other intensive tasks, that's where 64-bit really helps.
Otherwise there is very little difference between 32-bit and 64-bit. In theory, and probably in practice, there should be no bugs specific to 32-bit or to 64-bit. If you are having crashes or glitches, changing to 64-bit will not help.
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.