In dual boot PC, the boot/GRUB menu suddenly disappeared (Ubuntu option is not appearing anymore)

Posted by iammilind on Ask Ubuntu See other posts from Ask Ubuntu or by iammilind
Published on 2013-06-25T15:56:22Z Indexed on 2013/06/25 16:28 UTC
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Filed under:

grub2

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13.04

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dual-boot

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bootloader

I have been using Ubuntu 13.04 as my primary OS for quite sometime on Sony VAIO laptop with other OS being windows 8 (never use it). Till today, everything was fine.

In the evening I had shut down my PC and closed the lid; Typically I do this when the shutting down screen is still on. But probably this time it was fatal.

When I again restarted my PC, now no menu is appearing for selecting OS and it directly goes for Windows 8. My question is similar to this thread, but I don't have Ubuntu CD as I had installed using pen drive sometime back.

Is there any (genuine or workaround) easier way to get back the GRUB menu back in the place?
Note that keyboard shortcuts in Sony VAIO is different, here I have an "Assist" menu as well to get those internal options.

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