Possible Duplicate:
What is the difference between 32-bit and 64-bit and which should I choose?
I'm not sure as to what architecture of ubuntu go for... either 32 bit or 64 bit. I'm not sure if to go with the 64 bit since I have 12gb of RAM, so that with 64bit it will cover the 12gb.
Also I would like to know what are the disadvantages of each of them, either 32 or 64.
Thanks in advance! :)