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I used Startup Disk Creator to make a bootable USB stick for Xubuntu 12.04 (and then also for Ubuntu 12.04...).

On restarting the laptop with the stick inserted, I press F9 to select the boot device. The laptop detects the stick and displays the boot option ”USB hard disk”. I choose it. Then I get the message ”boot error”! Same for Ubuntu.

The stick is fine, I can save on it, read it, erase, format...

(Unfortunately, I cannot install any other application, since my OS, Ubuntu 12.04, was somehow corrupted on upgrade from 10.04. It still works but doesn't perform new application setups. And the DVD writer is kaputt after the first 3 years...)

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Well, could be any number of problems, fist stem, IMO, is to confirm the md5sum of the iso. help.ubuntu.com/community/HowToMD5SUM –  bodhi.zazen Jul 11 '13 at 17:34
Yes, I did get a checksum error message previously, from the Startup Disk Creator, and couldn't complete the installation on the USB stick. So I downloaded another version of the iso file from another source and this time the Disk Creator ran fine. The problem is boot does not work... –  Enver Hoxha Jul 11 '13 at 19:20
Can you post the full boot error ? Without more information my only guess is some hardware incompatibility, please tell us what hardware you have. –  bodhi.zazen Jul 11 '13 at 19:26
Just these 2 words: "boot error". –  Enver Hoxha Jul 11 '13 at 20:50
Hardware? Core 2 Duo T5470, 2GB RAM, HD 120 GB (37 free). Ubuntu 12.04, Kernel Linux 3.2.0-49-generic-pae. Plus Win XP (2 partitions, double boot). –  Enver Hoxha Jul 11 '13 at 20:57
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