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Why Ubuntu Won’t Start with AE_NOT_FOUND Error

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In the world of Linux, Ubuntu is a popular choice for many due to its user-friendly interface and robust performance. However, like any other operating system, it can occasionally run into problems. One such issue that users may encounter is the “AE_NOT_FOUND” error that prevents Ubuntu from starting up. This article aims to provide an in-depth understanding of this error and how to resolve it.

Quick Answer

The "AE_NOT_FOUND" error in Ubuntu occurs when the Advanced Configuration and Power Interface (ACPI) is unable to locate a device or object it needs to perform its operations. This error can be caused by a corrupted file system, incompatible hardware, or an outdated BIOS. To fix the error, you can try booting from a Ubuntu Live DVD or USB, opening the Terminal, running the e2fsck command, and restarting your computer. If these steps do not resolve the issue, further assistance may be needed.

Understanding the AE_NOT_FOUND Error

The “AE_NOT_FOUND” error in Ubuntu typically arises due to issues with the Advanced Configuration and Power Interface (ACPI), a standard that controls hardware and power management. The error message indicates that the ACPI is unable to locate a device or object that it needs to perform its operations.

Causes of the AE_NOT_FOUND Error

This error can occur due to a variety of reasons, including:

  1. Corrupted File System: A corrupted file system can lead to this error. The corruption can happen due to improper shutdowns, hardware failures, or even due to bugs in the operating system.
  2. Incompatible Hardware: If you have recently installed new hardware, it might not be compatible with the ACPI, leading to this error.
  3. Outdated BIOS: An outdated BIOS can sometimes cause this error, especially if it’s not fully compatible with the ACPI.

Fixing the AE_NOT_FOUND Error

To fix this issue, you can try the following steps:

Step 1: Boot from Ubuntu Live DVD or USB

First, boot your computer using a Ubuntu Live DVD or USB. This will allow you to access your system and perform the necessary repairs without having to boot into the main operating system.

Step 2: Open the Terminal

Once you have booted from the Live DVD or USB, open the Terminal. The Terminal is a command-line interface that allows you to interact with your system.

Step 3: Run the e2fsck Command

In the Terminal, run the following command:

sudo e2fsck -b 32768 /dev/sdb5

Let’s break down this command:

  • sudo: This command allows you to run commands with administrative privileges.
  • e2fsck: This is a filesystem check and repair tool for ext2/ext3/ext4 filesystems.
  • -b 32768: This option tells e2fsck to use an alternate superblock at the specified location. A superblock contains critical information about the filesystem.
  • /dev/sdb5: This is the device name of the partition to be checked.

This command checks and repairs the ext2/ext3/ext4 filesystem on the /dev/sdb5 partition. If the device is valid and contains a valid ext2/ext3/ext4 filesystem, the command will fix any corruption issues.

Step 4: Restart Your Computer

After running the e2fsck command, wait for it to complete the filesystem check and repair process. Once the process is finished, restart your computer and check if Ubuntu starts without any errors.


The “AE_NOT_FOUND” error can be a frustrating issue for Ubuntu users. However, with the right knowledge and tools, it can be resolved. If the above steps do not resolve the issue, it is recommended to seek further assistance from Ubuntu support forums or consult a professional for advanced troubleshooting.

Remember, always back up your data regularly to prevent data loss in case of filesystem corruption or other issues.

Finally, keep your system updated, including your BIOS, to prevent such errors from occurring in the future.

How can I determine if my file system is corrupted?

You can use the e2fsck command to check and repair the file system for corruption. Refer to Step 3 in the article for detailed instructions.

Can the AE_NOT_FOUND error be caused by hardware failures?

Yes, the AE_NOT_FOUND error can be caused by incompatible or faulty hardware. If you have recently installed new hardware, it is worth checking if it is compatible with the ACPI.

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