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my version of Ubuntu 12.04 was working fine until I instlalled some updates. After this windows 7 would not load.

I changes some settings to get the windows boot loader to work but now Ubuntu will not get to the log in screen. When selected in the boot manager, it flashes a purple screen for barely a second and returns to the boot manager. Happens every time.

Bit of a beginner in this so not too sure what to do.

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