Loaded Ubuntu 11.10 (64 bit) onto brand new Vostro 3555 (AMD A6) and won't boot (black screen).
Tried nomodeset in Grub.. still nothing. At a loss.
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Found the fix. You get yourself to the boot prompt and then log in to your system. Then install fglrx using the command:
After that, log into your graphical interface and then enable your 'proprietary software'. In this case, it is the AMD / ATI.