These are the Ubuntu System Requirements...
[Minimum requirements]
- 300 MHz x86 processor
- 64 MB of system memory (RAM)
- At least 2 GB of disk space (for full installation and swap space)
- VGA graphics card capable of 640x480 resolution
- CD-ROM drive
> If your system has less than 192 MB of system memory, use the Alternate Installation CD.
[Recommended minimum requirements]
- 500 MHz x86 processor
- 192 MB of system memory (RAM)
- 8 GB of disk space
- Graphics card capable of 1024x768 resolution
- Sound card
- A network or Internet connection
> Note: All 64-bit (x86-64) PCs should be able to run Ubuntu. Use the 64-bit installation CD for a 64-bit-optimised installation.
Kilde:
http://ubuntuforums.org/archive/index.php/t-75868.html