A reinstall will rewrite the MBR and refresh the modules in the boot/grub folder. Reinstalling Grub 2 may be another option. If Ubuntu now boots, run the dpkg-reconfigure command and be sure to include the internal drive in the "Grub install devices" options. Example: If you installed to your interneal hard drive from a USB drive, change the BIOS to boot from the USB drive first. Once booted and in your normal Ubuntu system, run "sudo dpkg-reconfigure grub-pc" and select additional devices on which to write Grub 2. If you installed Grub 2 from another device, changing the boot order to the original installing device may find a bootable Grub installation. The "Boot Repair" information for now can be found in Post #171 of this thread:Ĭhange the BIOS boot order. There is a GUI application created by forum member YannBuntuthat can, among other things, reinstall Grub2 (rewrite to the MBR and generate a new core.img file), or to completely purge and reinstall Grub 2 in the Advanced Options (you will still have to enter one command in the terminal). Depending on your experience level, Absolute Beginners () or Installation & Upgrades () might be appropriate forums. If you need help interpreting the output of the boot info script, please start your own thread in one of the other forums. Doing the least necessary to fix a system is generally a good idea. Other methods, such as "grub-install" or "grub-install -reinstall" are less intrusive on your system. You will lose any customizations you have made to your Grub 2 configuration files. If you designated the wrong drive/partition during the initial install, you may make the same mistake again. The reasons for this include:ĭuring this procedure, you will temporarily have no bootloader on your system. I would recommend this procedure only after running meierfra's boot info script () and finding no obvious discrepancies. Note: If you can get to your normal installation without using a Live CD the chroot procedure is not necessary and you need only Steps 2-5. In this post, we will completely remove and then reinstall Grub 2 using an Ubuntu Desktop Installation CD (), which I will refer to as the Live CD. HOWTO: Purge and Reinstall Grub 2 from the Live CD
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