Ubuntu 11.04
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Download Ubuntu 11.04 Natty Narwhal
[1] Download Ubuntu 11.04 ( released on 28 April, 2011 ) from the following site.


It's OK to download 64 bit version commonly.
But if your computer is old and not supported 64 bit computing, download 32 bit version.

* The example on this site uses 64 bit version of Ubuntu 11.04.

[2] Burn ISO file to DVD with an apprication on your computer for burning and Make an Installation Disk. After finishing it, proceed to next step for installing Ubuntu 11.04.