[ubuntu] Battery (not present) after installing ubuntu 12.04

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http://ubuntuforums.org – Hi, I had ubuntu 10 - 64bit running on my netbook but recently installed 12.04 64bit. Everything was fine until a couple of weeks past. Now the battery indicator says (not present) and if I remove the a/c cable it instantly shuts down. I am pretty sure this is not a hardware problem. Any help is greatly appreciated. Thanks (Hardware)