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I have uninstalled Ubuntu 12.04 and installed Ubuntu 13.04 instead. It told me that Ubuntu is installed and that I need to restart my PC. After restarting I got an error message that said: operating system not found.

How can I fix this?

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Try to boot using the live CD and install Boot Repair program:

sudo add-apt-repository ppa:yannubuntu/boot-repair
sudo apt-get update
sudo apt-get install boot-repair

then launch Boot Repair, use the default settings and follow the instructions (it may ask you to do something manually)

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