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I have a notebook model Samsung NP300E4C-AD2BR with Windows 8 and I want to install Ubuntu with it in dualboot from a pen drive (USB port, I don't have a DVD to burn the ISO). I have already deactivated windows 8 faststartup and the secure boot on the bios. I needed to change the OS Mode from UEFI OS to UEFI and CSM OS in order to boot from USB. I created the USB with YUMI. When I select to run Ubuntu from the USB, at some point, it gives me the message unable to find a medium containing a live file system and never open Ubuntu. I have already checked the MD5SUM and the port is a 2.0 and not 3.0 USB. Anyone knows what could be the problem? I'm using Ubuntu 12.04 64bits version.

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