Software & AppsOperating SystemLinux

How To Fix COMRESET Failed Error on Ubuntu Boot?

Ubuntu 13

In this article, we will discuss how to troubleshoot and fix the “COMRESET failed” error that you may encounter during the boot process of your Ubuntu system. This error is typically related to hard drive or SATA connection issues and can prevent your system from booting properly.

Understanding the COMRESET Failed Error

The COMRESET failed error usually indicates a problem with the communication between your system and your hard drive. It is typically seen in the initramfs prompt during the boot process. This error can be caused by several factors such as faulty hardware connections, problems with the hard drive partition, or issues with the Native Command Queuing (NCQ) feature of SATA hard drives.

Troubleshooting Steps

1. Exiting initramfs

When you encounter the initramfs prompt, simply type exit and press enter. This command will attempt to continue the boot process and may take you to the login screen if the error was a one-time occurrence.

2. Running fsck

If exiting initramfs does not solve the problem, you may need to run the fsck command. This command checks the integrity of your file system and fixes any errors it finds. To do this, select the fsck option from the menu that appears after you exit initramfs.

The fsck command takes the following form:

fsck /dev/sda1

In this command, /dev/sda1 is the partition to be checked. Replace this with the partition of your hard drive.

3. Checking Hard Drive Partition

If the problem persists, there may be an issue with the hard drive partition. Make sure that the /home partition is properly mounted. You can check this by running the df -h command, which displays the disk usage of each partition.

4. Verifying Hardware Connections

Ensure that all SATA ports are enabled in your system’s BIOS. You can also try switching between different modes such as RAID, SATA, and AHCI to see if this resolves the issue. Additionally, consider using new SATA cables to rule out any cable-related issues.

5. Disabling NCQ

If none of the above solutions work, you can try disabling NCQ. This can be done by editing the grub configuration file located at /etc/default/grub.

Open the file with a text editor using the following command:

sudo nano /etc/default/grub

Find the line GRUB_CMDLINE_LINUX_DEFAULT and add libata.force=noncq to it. It should look like this:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash libata.force=noncq"

Save the file and exit the editor. Then, run the following command to update grub:

sudo update-grub

This command updates the grub bootloader with the new configuration.

Once you’ve made these changes, restart your system to see if the error has been resolved.


Troubleshooting the COMRESET failed error involves a series of steps that include exiting initramfs, running fsck, checking your hard drive partition, verifying hardware connections, and disabling NCQ. If none of these solutions work, it may be necessary to seek further assistance or consider other troubleshooting steps. Remember to always back up your data regularly to prevent data loss during the troubleshooting process.

How do I access the initramfs prompt?

To access the initramfs prompt, you need to interrupt the boot process by pressing the "Esc" key or "Shift" key (depending on your system) when the Ubuntu splash screen appears. This will take you to the GRUB menu. Select the advanced options for Ubuntu and choose the recovery mode option. From there, you will see the initramfs prompt.

How do I know if there is an issue with my hard drive partition?

You can check if there is an issue with your hard drive partition by running the df -h command in the terminal. This command will display the disk usage of each partition on your system. Look for any unusual or unexpected behavior, such as missing or incorrectly mounted partitions.

How can I enable or disable SATA ports in the BIOS?

To enable or disable SATA ports in the BIOS, restart your system and enter the BIOS setup by pressing a specific key (usually Del, F2, or F10) during the boot process. Once in the BIOS setup, navigate to the "Advanced" or "Storage" section and look for an option related to SATA ports. Enable or disable the desired ports and save the changes before exiting the BIOS setup.

How can I edit the grub configuration file?

You can edit the grub configuration file by opening a terminal and running the command sudo nano /etc/default/grub. This will open the grub configuration file in the nano text editor. Make the necessary changes to the file, save it by pressing "Ctrl + O", and exit the editor by pressing "Ctrl + X". Remember to run sudo update-grub after making changes to update the grub bootloader with the new configuration.

What should I do if none of the troubleshooting steps work?

If none of the troubleshooting steps mentioned in the article work, it is recommended to seek further assistance from the Ubuntu community forums or consult a professional for advanced troubleshooting. They may be able to provide more specific guidance based on your system’s configuration and hardware setup.

Leave a Comment

Your email address will not be published. Required fields are marked *