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How To Fix ACPI Error AE_NOT_FOUND When Booting After Upgrading to Ubuntu 22.04 from 20.04

Ubuntu 5

If you have recently upgraded your Ubuntu version from 20.04 to 22.04 and you’re encountering ACPI errors when booting with the 5.15.0.37-generic kernel, this article is for you. We will walk you through the steps to resolve the ACPI Error AE_NOT_FOUND.

Quick Answer

To fix the ACPI Error AE_NOT_FOUND when booting after upgrading to Ubuntu 22.04 from 20.04, you can try disabling ACPI, updating your BIOS, or ignoring the error if your system is working fine. However, it’s important to note that disabling ACPI is not recommended as it can lead to other issues.

Understanding ACPI Error AE_NOT_FOUND

ACPI (Advanced Configuration and Power Interface) is an industry standard that defines power and configuration management interfaces between an operating system and the hardware. It’s crucial for power management, system configuration, and even hardware discovery during the boot process.

The AE_NOT_FOUND error typically indicates that a required ACPI object wasn’t found. This could be due to a variety of reasons, including a bug in the kernel, a problem with the BIOS, or an issue with the ACPI tables.

Possible Solutions

1. Disabling ACPI

One of the easiest solutions is to disable ACPI. However, this is not recommended because ACPI is crucial for power management and system configuration. Disabling it could lead to other issues.

To disable ACPI, you would need to edit the GRUB file. Open the terminal and type the following command:

sudo nano /etc/default/grub

Find the line that starts with GRUB_CMDLINE_LINUX_DEFAULT and append acpi=off at the end of the line. It should look something like this:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi=off"

Save and close the file by pressing Ctrl+X, then Y, and finally Enter. Then, update GRUB with the following command:

sudo update-grub

After rebooting the system, ACPI should be disabled.

2. Updating BIOS

Another possible solution is to update your BIOS. Sometimes, ACPI errors are caused by outdated BIOS versions. Please refer to your motherboard’s manual or the manufacturer’s website for specific instructions on how to update your BIOS.

3. Ignoring the Error

If your system is working fine despite the error, you can choose to ignore it. However, this is not a solution and the error may lead to other issues in the future.

Additional Resources

For more information on finding ACPI drivers for specific devices and resolving ACPI errors, you can refer to the following resources:

In conclusion, while ACPI errors can be concerning, they can be resolved with a bit of troubleshooting. If your system is working fine with the older kernel version (5.13.0-48-generic), you can continue using it. However, if you wish to resolve the ACPI errors with the newer kernel version, you can explore the suggested solutions above.

Can I safely disable ACPI to resolve the AE_NOT_FOUND error?

Disabling ACPI is not recommended as it is crucial for power management and system configuration. Disabling it could lead to other issues. It is better to explore other solutions mentioned in the article.

How do I edit the GRUB file to disable ACPI?

To edit the GRUB file, open the terminal and type sudo nano /etc/default/grub. Find the line that starts with GRUB_CMDLINE_LINUX_DEFAULT and append acpi=off at the end of the line. Save and close the file by pressing Ctrl+X, then Y, and finally Enter. Update GRUB with the command sudo update-grub. After rebooting the system, ACPI should be disabled.

What should I do if disabling ACPI doesn’t resolve the error?

If disabling ACPI doesn’t resolve the error, you can try updating your BIOS. Outdated BIOS versions can sometimes cause ACPI errors. Refer to your motherboard’s manual or the manufacturer’s website for instructions on how to update your BIOS.

Is it safe to ignore the ACPI error if my system is working fine?

While you can choose to ignore the ACPI error if your system is working fine, it is not a recommended solution. The error may lead to other issues in the future. It is advisable to troubleshoot and resolve the error to ensure the stability and proper functioning of your system.

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