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How to install ubuntu on z 580

dear anyone,
                       hey i have purchased a lenovo z 580 ,and i want to install ubuntu on it along with the win7 home basic that came with the laptop ,when iam trying to install it is not showing the win 7 .... that it genrally shows when we want to install side by side os.......
pls anyhelp will be great
thanks in advance
The best answer: Take e look at this thread
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My hardware: TP x120e 0596-2ru. Windows 7, sp1, 64Bit, English, installed in UEFI mode.