You need a MBR and a bootloader of some sort. If you see any messages that GRUB would display when it encounters failure then you 've got grub installed. There's nothing about GRUB in there specifically. Previous post. Next post. On the first screen, choose the language and press [Enter] key to continue. On the next screen, press F6 function key in order to open the other options menu and select Expert mode option. Then, hit Escape key to return to Boot Options line in editing mode, as illustrated in the below screenshots.
Next, edit Ubuntu live image boot options by using the keyboard arrows to move the cursor just before the quiet string and write the following sequence as illustrated in the below screenshot. On the next screen select the language you want to perform the system rescue and press [enter] key to continue. Next, select your appropriate location from the presented list and press [enter] key to move further.
On the next series of screens, select your keyboard layout as illustrated in the below screenshots. After detecting your machine hardware, loading some additional components and configuring the network you will be asked to setup your machine hostname. Next, based on the supplied physical location the installer image will detect your time zone. This setup will accurately work only if your machine is connected to internet.
Just press Yes to continue further. Here, you should choose your machine root file system from the provided list. In case your installed system uses a logical volume manager to delimit partitions, it should be easy to detect your root partition from the list by reviewing volume group names as illustrated in the below screenshot.
After selecting the root partition press [Enter] key to continue. Select Yes and press [Enter] key to continue. Next, you will be provided with Rescue operations menu. On the next screen, type your machine disk device where the GRUB will be installed and press [Enter] to continue, as shown in the below image. After the live system installs the GRUB boot loader you will be directed back to main rescue mode menu.
Here is the diff:. Now you really should be ready to shut own the Live Demo system, remove the DVD if any, and reboot in the normal way. The procedures in section 1. Now that the system is up and running, so that the time pressure is off, we can do some housekeeping:. However, consider the situation where the Live Demo system you used to restore the MBR is using a different version of grub.
Maybe one system is out of date, or maybe just exercised the option to use a different version. This is your chance to install the grub version that your system thinks should be installed. There are several scenarios that can lead to an MBR being overwritten or otherwise rendered unsatisfactory. Examples include:. Suppose you have a dual boot system, i. Every time you install or reinstall Windows, it installs its own boot loader into the MBR.
This is a problem, because the MS boot loader will not load anything except the MS operating system This is fine as far as it goes, but it is not always possible. For instance, sometimes it is necessary to reinstall or upgrade the MS stuff, days or months or years after Linux was installed. The grub-reinstall procedure described in this document takes only a few minutes, so feel free to install MS after Linux if you find it necessary or convenient to do so.
MS will trash the MBR, but you can restore it using the techniques described here. Keep in mind that sector zero contains both the stage-0 boot code and the primary partition table. Therefore, before restoring the boot sector, you have to make a decision:.
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