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I just installed 12.04 LTS onto my Acer Aspire One from a USB thumbdrive, and I cannot reboot unless I boot from the USB drive. If I have the USB drive plugged in, it boots, and it looks like the system is running of the HDD (/ is mounted from there, the USB drive is /media/PENDRIVE, everything works fine when I unmount it, etc).

If I reboot with no USB drive mounted, I just get a flashing cursor. It looks like a misconfigured boot loader. The Terminal tells me that grub is not installed ... so just how does Ubuntu boot these days, and how can I make the HDD bootable?

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up vote 2 down vote accepted

Possibly you have installed grub in the usb not in hard disk.

To install grub in hard disk,

  1. Boot using ubuntu live usb,
  2. install boot-repair by using the following commands.

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

    sudo apt-get install -y boot-repair && boot-repair

  3. Launch boot-repair from dash and perform a repair. If it doesn't fix remember the url notified by boot-repair tool (like and post the url.

A detail reading of boot-repair may help you,

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Thanks! That was exactly what I needed to find. – Thomas May 1 '12 at 12:15

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