Ubuntu 12.04 LTS is supported for 5 years, and will get some core updates for 2 years : I guess those updates include the kernel, graphic drivers and X11. But will these updates be optionnal, or not ? I would like to stick with my present version of the kernel and X11, because I'm using an AMD/ATI graphic card with fglrx driver, but according to this link, support for ATI HD 2000/3000/4000 cards will be dropped soon. Thanks !