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I tried unetbootin and pendrive, and nothing helps. After i choose usb from boot menu error message (missing operating system) appears for a sec and continue to boot other system on hdd, in my case Windows 7. Do i have to wait final release or this can be fixed? Thanks.

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closed as off topic by Jorge Castro, Mateo, Eric Carvalho, Kevin Bowen, Thomas W. Apr 8 '13 at 7:04

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It usually boots. Please check whether the live disk is being marked as bootable. Also I faced once this problem with 13.04 /casper/vmlinuz: not found –  Web-E Apr 4 '13 at 7:48
It seems that Ubuntu was not installed correctly to the flashdrive and is not being recognized as an operating system. Try using Lili instead, it worked great for me. –  Alex Apr 4 '13 at 9:05
I also have the same problem with today's final release. Do you know can I ask for help??? Don't tell me I should install windows to use Lili... –  opensas Apr 26 '13 at 2:05