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[ubuntu] Unable to find a medium containing a live file system

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http://ubuntuforums.org – Guys, I'm having trouble installing Ubuntu 12.04 (64bit) on my Acer laptop. Every time I boot from an USB drive, it goes to the BusyBox with the following error: Unable to find a medium containing a live file system I've already tried some of the suggestions from other threads, but none of them works. What I have tried so far: 1. acpi=off 2. Disconnect all USB devices, but the drive 3. Change SATA to AHCI (it's already my default) 4. Check for OS detection on the BIOS (my BIOS doesn't have this) 5. MD5SUM the ISO file (It was ok) 6. Try creating the bootable USB with different softwares (I (Hardware)