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I set windows 7 to load by default by editing grub file. I set the time to display os selection menu at 0.5 seconds. Now the ubuntu's pink os selection screen flashes away too quickly. I tried pressing all the keys but none seen to freeze that menu.

How do I boot Ubuntu again?

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You could boot from a live CD, mount your disk partition and edit the /etc/default/grub file on the disk.
You would search for a line like this:
GRUB_TIMEOUT=0.5
and change the timeout to something else like 5 (5 sec).

That should give you more time.
If it does not solve your issue* or if you have problems* or need more detailed instructions, please leave me a comment.

(*) In this case it would be useful if you could post the contents of this file as an edit to your question.

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