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I installed 12.10 to my SSD with EFI and if I use the shutdown option from the system menu it starts to shutdown but after turning off my HDDs it fails to power off completely.

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I would recommend adding more info to your question. Most importantly what does it look like when it fails to power off completely, and what hardware are you using. –  coteyr Nov 21 '12 at 10:40
i am really not happy about this problem which i have been facing since today morning. i installed ubuntu linux 12.04 and faced shutdown problem on my new laptop and it would not shutdown but hang up and also at times starting it, it would hang. so i decided to upgrade to version 12.10 but both these problems are still there i,e shutdown hangs and at few times , starting/loading ubuntu also hangs. i have to force shutdown everytime by pressing the power button. my laptop is Acer Aspire 5560 Laptop (AMD APU Quad Core A6/ 4GB/ 500GB/ 512MB Graph) AMD Radeon HD 6470M. plz provide me with some sta –  user110454 Nov 24 '12 at 20:11
Had the same issue. This worked for me: askubuntu.com/questions/217587/… –  user119732 Jan 8 '13 at 14:56
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