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When I boot my computer, the purple Ubuntu splash appears (without the orange dots) for a split second, and then the screen turns black. I was able to get the Xorg.0.log from the command line. I think this happened after installing the proprietary drivers for my Radeon HD 6770.

Xorg.0.log file (Sorry, file is too big)

Any idea what's going on?

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The key here is line 589 onward:

incompatible kernel module detected - HW accelerated OpenGL will not work

Right now, the X server in the repos does not work well with any fglrx driver in the repos. So do the following steps:

  1. Hold Shift during boot to see the Grub menu.
  2. Go to "Advanced Options for Ubuntu" using the down-arrow key and then scroll down once to the first Recovery Mode kernel option.
  3. Go down to the option that says "enable networking" and press Enter.
  4. Go down to the option that says "root shell prompt" and press Enter.
  5. Very carefully type the following commands (for the long filename try just typing amd and then press Tab):

    apt-get -y install build-essential
    mkdir fglrx
    cd fglrx
    wget --referer=''
    chmod a+x

You will be prompted to agree to a license agreement. Do not build the distribution-specific driver package when given the option. Go with the "Standard" or non-"Expert" install type. Enter through all the other options. Wait until you are allowed to return to the prompt and press Ctrl+Alt+Delete to reboot.

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try to login with your account in a terminal then use this command "startx".

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