I'm having same problem of "can't access tty" while booting from live usb. I used dd to burn the image onto usb and tried with both cdrom & hard-disk options using F4. In both cases tried keeping source blank and entered as /dev/sdb, /dev/sdb1 etc.
It seemed to recognise a live image under /dev/sdb1, however it says unable to find unix.dep, i8042.dep, iatkbd.dep in modules.dep before finally throwing that error.
Any suggestions on how to fix this?
thanks.