Software⏱️ 4 min read📅 2026-06-11

How to Fix: grub2 error: out of disk

Grub installation issue on USB hard disk Ubuntu-bootable Compaq nc6220 laptop.

Quick Answer: Check if the /boot/grub grubenv file is present and correctly formatted, as it may be causing the 'out of disk' error.

📋 Table of Contents

  1. 💡 Why You Are Getting This Error
  2. ✅ Best Solutions to Fix It
  3. 💡 Conclusion

The 'out of disk' error in Grub2 is typically encountered when there's an issue with the partition table or the bootloader itself. This specific error affects users who have installed Ubuntu on a removable storage device, such as a USB hard drive, and are experiencing difficulties booting their system.

This error can be frustrating because it prevents the user from accessing their operating system, making it difficult to perform essential tasks like data recovery or troubleshooting. In this guide, we'll explore possible causes of the 'out of disk' error in Grub2 and provide solutions to resolve this issue.

💡 Why You Are Getting This Error

  • The primary cause of the 'out of disk' error in Grub2 is a misconfigured partition table on the removable storage device. When you install Ubuntu on a USB hard drive, it's essential to ensure that the partition table is correctly configured to accommodate the bootloader and the operating system.
  • Another possible reason for this error could be an issue with the bootloader itself, such as a corrupted or outdated Grub configuration file.

✅ Best Solutions to Fix It

Reconfiguring the Partition Table

  1. Step 1: Step 1: Identify the correct partition layout for your USB hard drive. You can do this by using the `fdisk` command in the live session or by checking the disk's properties in the Linux file system hierarchy standard (FHS) documentation.
  2. Step 2: Step 2: Use the `fdisk` command to reconfigure the partition table on your USB hard drive, ensuring that the bootloader and operating system are correctly mapped to their respective partitions. For example, you might need to create a separate partition for the bootloader or adjust the existing partition layout to accommodate the bootloader's requirements.
  3. Step 3: Step 3: Save your changes and exit the `fdisk` command. Then, restart your laptop and attempt to boot from the USB hard drive.

Updating Grub Configuration

  1. Step 1: Step 1: Update the Grub configuration file on your removable storage device using the `grub-mkconfig` command. This will ensure that the bootloader is correctly configured to read from the correct partition.
  2. Step 2: Step 2: Verify that the updated Grub configuration file has been applied by checking its contents using the `cat` or `less` commands. You can do this by opening a terminal and typing `cat /boot/grub/grub.cfg` or `less /boot/grub/grub.cfg`.

💡 Conclusion

To resolve the 'out of disk' error in Grub2, it's essential to identify and address any issues with your partition table or bootloader configuration. By reconfiguring the partition layout and updating the Grub configuration file, you should be able to successfully boot from your USB hard drive. If you're still experiencing difficulties, consider seeking further assistance from online forums or technical support resources.

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