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I have Windows 7 x64 installed but after installing Ubuntu 12.10, it asks me to restart but the GRUB loader doesnt even show up, directly boots into Windows What can i do for that ??

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Probably you did not install Grub correctly. Maybe you have chosen the wrong disk where to install Grub. – To Do Nov 18 '12 at 14:29
so where should i exact;y install the grub, i used to do in the same way earlier, it worked – witcher3 Nov 18 '12 at 16:24
See my answer below. Hope it works for you. – To Do Nov 18 '12 at 16:54

You can find a site to download a boot repair disc like this burn it and then start the system. It will repair your boot. Otherwise press the F12 when windows starts and see If Ubuntu is on boot devises.

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  1. Boot a liveDVD or liveUSB
  2. Check where Ubuntu is installed. If your Ubuntu partition is on say sda4 then you should install grub on sda without the last digit.
  3. Open a terminal (ctrl + alt + T) an type sudo grub-install /dev/sda changing sda accordingly.

More detailed information here.

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try creating ubuntu boot disc/pendrive with SecureBoot

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Thanks a lot for your answer, but could you please provide step by step instructions for anyone who is unclear about what you're talking about? – Chris Wilson Dec 3 '12 at 15:10

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