Type the following command in the terminal (CTRL + ALT + T):
If the value returns either i386 or i686, the system is 32-bit.
If it returns x86_64, you have a 64-bit system.
If you get other thing else, you most likely type the wrong command or come from the future (128-bit?).
😛 ~Bonus~ 😛
- Difference between i386 and i686 is rather trivial. Basically, i386 (Intel 80386) is an older processor than i686 (P6: 6th gen of intel x86 system and is mostly used in Pentium CPUs).