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I have installed Kubuntu 11.04 and had to install it several times before it would boot up after the CD install. I would get the message that no operating system found. I upgraded to 11.xx and it worked fine. I then wanted to put 12.04 on the HP desktop and it will not boot either after several installs. I went back to try to install the 11.04 as it worked before but now it does not boot either. I need help with this process. Anyone out there have any suggestions?

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Boot from a live CD, mount the hard drive, then check the logs in /mount_path/var/log.

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