I have Minecraft 1.5.2 and Java 6 and I realized that I could not install or use Optifine. Can anyone help?
As I have seen its not possible to give you either full answer or part of the answer but there is a wonderful tutorial which can help you to play optfine in Ubuntu . that can help you completely .
Optifine is a Minecraft mod pack that allows the user to optimize their game performance "to run faster and look better with full support for HD textures and many configuration options".
Some features include:
See the Optifine FAQ for details on tuning suggestions.
A. Easy Installation
B. Manual Installation
The main page for installation details, configuration, and support can be found here.