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I have windows 7 ultimate installed in my laptop. Yesterday I have installed ubuntu 12.10 using usb drive as dual boot system. after the successful installation of the ubuntu in a different partition i cant access ubuntu. when i start my laptop it's directly booting in to windows 7 and nothing showing in the boot menu whether i want to use windows 7 or ubuntu 12.10 After that when I have tried to install ubuntu again to check whether ubuntu successfully installed or not then it's showing the ubuntu is already installed. Please help me to recover this problem.

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Read this: askubuntu.com/questions/88384/… –  kalpetros Apr 4 '13 at 5:21
@KalPetros - I don't know... he hasn't re-installed Windows. Rumman Rumi, can you please try holding the Left Shift key as soon as the PC turns on? –  nerof61 Apr 4 '13 at 7:51
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