I tried to use Ubuntu 12.04 from last week. For the total view, I think 12.04 is the most stable version except default desktop. This meaning is that if you will clean-install from zero then the system is so stable. I tried to update from 11.10 to 12.04. The updating was completed. But it was not stable especially x-windows system. Usually, I work on ubuntu and intelli-j. So, x-windows system's problem is critical for me ^^;; Finally, I formated the system partition and reinstall 12.04 from zero. And, I changed window manager to GNOME, then the system became quite good. Before 11.10, my computer could not find sound board. ( my computer has one sound card, one onboard sound card, and one USB sound card) I think my computer could know the usual sound card when i installed 10.04(?). However, after some updating, the system could not find any sound card. So, I gave up to setting up and I bought new USB sound card. However, it was not worked on my computer, too. However, when I ...