HOW TO KNOW YOU ARE RUNNING A 32-BIT OR 64-BIT UBUNTU? If you have forgot what bit version of Ubuntu you are running. There is a nice and simple command line program called uname that tells the current bit version Open Terminal. Type uname -m in terminal and hit enter. If the response is i686 , you have a 32-bit version of Linux. If the response is x86_64 , you have a 64-bit version of Linux. If you want to know more details like Kernel version, Time stamp etc.. Try uname -a