[lubuntu] Ubuntu 12.04 won't shutdown

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http://ubuntuforums.org – Hi Forum, I am having an issue with a fresh install of Ubuntu 12.04. I purchased a new intel mobo Intel BOXDH77KC LGA 1155 Intel H77 HDMI SATA 6Gb/s USB 3.0 ATX Intel Motherboard and an i3-2100 CPU. When I installed ubuntu everything works great. However, when I choose shutdown it begins to shutdown. Then it pauses..the fans stop..very briefly..and it reboots. It brings up the purple grub/recovery screen. I am so frustrated...I have no idea what is causing this. (Hardware)