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I was trying to upgrade from 12.10 to 13.04 and it messed up half way through, then it said the installation was complete. When I try to use it it says it can't read my graphics card and asks me if I want to run it in low-graphics mode! What went wrong and how can I fix it? btw, I have it on a 16 GB flash drive and with out it my computer does not function at all!

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Welcome to Ask Ubuntu. Please edit the question and add what kind of graphics card, Intel, AMD, or Nvidia, and model, and what kind of driver (open source, or additional) you are using. There is too little information in the question. –  user68186 May 2 '13 at 20:05
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