Possible Duplicate:
How to determine whether I run a 32bit or 64bit Ubuntu install
I typed uname -a in a terminal and I got the following output.
Is it 32 bit or 64 bit?
Linux my-laptop 2.6.32-24-generic-pae
#43-Ubuntu SMP Thu Sep 16 15:30:27 UTC 2010 i686 GNU/Linux