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It looks like your CPU doesn't have PAE support, which would be the case if it's an older one. I wonder if you could boot any Linux version and attach the contents of /proc/cpuinfo to this report, to confirm your CPU's model and capabilities. I'm also moving this bug to the proper package, which is the Linux kernel. Thanks for your report! ** Package changed: ubuntu => linux (Ubuntu) ** Changed in: linux (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/907390 Title: ubuntu12.04 doesn't boot To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/907390/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs