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I have a HP dc5750 with a triple-boot Win 7, Ubuntu 12.04, and Ubuntu 10.04. I can't see my sound card in Ubuntu 10.04 and I have sound in the other OS's. I believe that I lost the sound after installing the updates just after installing the system. Tried a fix that fixed the sound in Maverick Merekat, but doesn't work with Lucid Lynx. I am completely stumped on this any help is much appreciated my sound card is ALC260.