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I have downloaded the iso file and put it on a flash drive. After that i booted from the flash drive and the normal Ubuntu installation screen popped up. I clicked install now and it did everything right, but once I rebooted it will not come up. Why is this?

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Was this a WUBI install, to another partition on the hard disk, or to another device like a usb disk? Do you see the Grub screen at boot? Any error messages when it fails? Provide some more description of the problem and you will be more likely to get a helpful answer. – ubfan1 Dec 22 '12 at 18:12

It can be caused for two different things:

One is that if you edited partitions, maybe you installed Ubuntu in a non-bootable partition. Then you will need to reinstall Ubuntu and make sure it's installed in a primary partition and that it's able to boot from there.

Other thing that can cause that is currupted .iso file of the Ubuntu Live CD/USB, so you will have to download it again and reinstall Ubuntu from the new .iso you've downloaded.

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