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I have Windows 7 install already an later on I installed Ubuntu but after installation and reboot it wasn't showing dual boot option.

I'm a totally new user can anyone guide me quickly on this.

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I don get it, Is it ubuntu thats not booting or is it windows? – Amith KK Feb 18 '12 at 9:11

Try the following command

sudo update-grub

This will probably fix it

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You didn't write to which system Your PC boots by default. If it is Ubuntu then Amith KK's answer will do. If it is Windows then run


and find the option

 time limit

in BOOT tab and set it to 30 seconds.

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