How to Fix Boot Manager in Ubuntu

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A broken Ubuntu boot manager cannot boot into your Ubuntu system. If only the word "GRUB" appears with no other options when you boot your computer, Ubuntu's boot manager is broken. Fix Ubuntu's GRUB 2 boot manager by booting your computer with a Ubuntu Live CD. Once the Live CD desktop environment loads, repair the boot manager with a few commands.

Things You'll Need

  • Ubuntu Live CD
  • Boot into the Ubuntu Live CD. Place the Live CD into your computer's disc drive and restart the computer. Boot the Live CD in English by hitting "Enter" when asked for a language.

  • Open the Terminal application. Click "Applications" in the upper left corner of the screen when the desktop loads. Hover your mouse over "Accessories," then click "Terminal."

  • Identify the partition installed with Ubuntu. Type "sudo fdisk -l" into the Terminal window, then hit "Enter." See partition labels by typing "sudo blkid" and hitting "Enter." The Ubuntu partition is likely the largest partition. "/dev/sda1" is the Ubuntu partition on most systems.

  • Mount the Ubuntu partition. Type "sudo mount /dev/sdX# /mnt", replacing "X#" with the Ubuntu partition's code, then press "Enter." For example, "/dev/sda1" is the Ubuntu partition for most users.

  • Fix Ubuntu's boot manager. Reinstall the boot manager by typing "sudo grub-install --root-directory=/mnt/ /dev/sdX", replacing "X" with the Ubuntu drive's letter, and then hitting "Enter." For example, "/dev/sda" is the Ubuntu drive for most users.

  • Restart the computer into your Ubuntu system. Click the shutdown icon in the upper-right corner of your screen, then click "Restart." Confirm your intention by clicking "Restart" in the prompt window. Remove the Ubuntu Live CD from your disc drive when prompted, then close the drive and hit "Enter."

  • Login to your Ubuntu system. Type your username, hit "Enter," then type your password and hit "Enter."

  • Update the boot manager menu. Open the Terminal application by clicking "Applications" in the upper-left corner, clicking "Accessories," and then clicking "Terminal." Run the boot manager update command by typing "sudo update-grub" and hitting "Enter." Authenticate yourself by typing your password if prompted, then hitting "Enter."

Tips & Warnings

  • Ubuntu's boot manager breaks if you install Windows after Ubuntu. Install Ubuntu after Windows in the future; this will ensure the GRUB 2 boot manager does not break.

References

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