and you're using ubuntu 12.04 32bit live usb?
i use Ubuntu 12.04 LTS 32bit.
when my phone turn on i can use adb command.
but when it turn into bootloader i can't use fastboot command.
try: sudo fastboot devices
so with "sudo fastboot devices" works but just "fastboot devices" doesn't? strange, cause both work for me.
so i guess you'll have to start the fastboot commands with "sudo fastboot ......."
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