viz ukázka zde v AJ nekdo má problem to samé


Ubuntu 12.04 does not boot after installation
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I installed Ubuntu 12.04 by replacing my Windows installation. Everything worked perfectly. Then it asked me to restart. I did, but it does not go into a selection menu or start up menu. The screen is black and shows a blinking white stripe in the left top corner. Even after waiting 1 hour it did not start anything. What am I doing wrong?