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This question already has an answer here:

I downloaded 64bit Ubuntu and I put it on my USB. It is bootable, and BIOS is configured to boot from it. But when I turn on the laptop with USB in it, it says:

Bootmgr is missing. Press Ctrl+Alt+Del to restart.

I have windows 7 64bit installed and I want to keep it. (dual boot or something)

Device: HP PAVILION G7 1303

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marked as duplicate by psusi, Braiam, Eliah Kagan, Eric Carvalho, jokerdino Sep 2 '13 at 14:17

This question was marked as an exact duplicate of an existing question.

There is a problem in bootable media. Make linux bootable media by unetbootin or linux live for avoiding boot problems. You are getting this message because your USB is not made bootable perfectly. By just copying files with mounting iso not makes USB bootable.

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I am able to boot windows 7 I just have problems booting and installing Ubuntu – Matej Kranjec Aug 13 '12 at 7:15
@MatejKranjec make your USB bootable with Unetbootin. – K.K Patel Aug 13 '12 at 7:27
it is bootable. – Matej Kranjec Aug 13 '12 at 7:33
Go in bios change order of booting. Make USB Drive first in boot menu. – K.K Patel Aug 13 '12 at 7:37
I already did that. – Matej Kranjec Aug 13 '12 at 7:49

Try format it to ext3 or use another USB stick

share|improve this answer And what should I format to ext3? My usb or hard disk? – Matej Kranjec Aug 13 '12 at 8:25
Try MultiBootISO or install Wubi and format yours USB – Ktos Aug 13 '12 at 8:40
@Ktos While I think this is an answer, it would be much improved if you were to expand it answer to explain how to format it ext3, as Matej Kranjec has asked. (You can at least move the information from your comment reply into the answer, but it would be even better if you gave or linked to explicit steps. Screenshots could be helpful too.) – Eliah Kagan Aug 18 '12 at 2:37
Personally, I fail to see how using Ext3 would help. It sounds to me like the drive somehow got a Windows 6.x-like (eg Vista, Seven, Eight) bootloader installed. I would suggest you simply use LILI to create a bootable USB drive. Reformat to FAT32 if necessary. – TSJNachos117 Jul 22 '13 at 23:58

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