Hello, Can I Update beaglebone with latest software from windows os and then use on Ubuntu 12.04LTS? I have no past experience of working with it thats why asking this stupid question.
If you are talking about your host computer, yes. It doesn't matter if you
use one operating system to write to the microSD card to flash the board
and then use another operating system or computer to interact with your
board.
It is also possible to run Ubuntu on your board, so I'm not sure if you are
talking about that.
http://elinux.org/Beagleboard:Ubuntu_On_BeagleBone_Black