Ubuntu Linux 11.10 [Direct Link]

                                                                 

System requirements

The desktop version of Ubuntu currently supports the x86 32 bit and 64 bit architectures. Unofficial support is available for the PowerPC,^[34] IA-64 (Itanium) and PlayStation 3 architectures (note however that Sony officially removed support for OtherOS on the PS3 with firmware 3.21, released on 1 April 2010), as well as ARM mobile processors (see HTC HD2).^[35] A supported GPU is required to enable desktop visual effects, including the Unity shell. In case such a GPU is not available the GUI falls back to a 2D version of Unity.

Current Minimum Requirements[36][37][38][39]	Server	Desktop
Processor (x86) with the i686 instruction set[40]	300 MHz	700 MHz
Memory (RAM)	128 MB (128 × 10242 bytes)	384 MB (384 × 10242 bytes)
Hard Drive (free space)	1 GB (1 × 10003 bytes)	5 GB (5 × 10003 bytes)
Monitor Resolution	640×480	1024×768

Tests reveal that among the four major desktop environments, a default installation of Ubuntu has the lowest possible memory utilization when used with LXDE 0.5, with Xfce 4.6 ranking second and GNOME 2.29 third, while the desktop with the highest RAM usage is KDE 4.4
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