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I upgraded from 10.04 to the next version and now I see the Ubuntu logo briefly and the screen goes blank. I can get to the recovery mode. How can I fix this problem without losing the existing data?

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10.04 then. I apreciate specific help instead of a reference to a previous question that's not helpful. – Zeynel Dec 8 '13 at 15:13

I recommend to make a boot repair. For that refer the following link:

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The problem is I cannot boot from USB. I have Samsung laptop and I could not figure out how to change BIOS to boot from… – Zeynel Dec 8 '13 at 15:31
Try watching the following video: – Varun Das Dec 8 '13 at 15:35
Try reading the video comments also. – Varun Das Dec 8 '13 at 15:36
Thanks. This was helpful. I changed the setup as instructed but it still goes to GRUB screen instead of booting from USB. – Zeynel Dec 8 '13 at 15:53
Have you disabled the Fast boot option in the BIOS? – Varun Das Dec 8 '13 at 15:59

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