Enhanced system performance

Oct 13, 2025 by talynt.org 127 views

Introduction

Ubuntu Jammy HWE (Hardware Enablement) kernel is a long-term support (LTS) kernel that provides a stable and secure environment for Ubuntu users. However, sometimes you may need to re-compile a single module in the kernel to fix a specific issue or to add new functionality. In this article, we will guide you through the process of re-compiling a single module in the Ubuntu Jammy HWE kernel.

Prerequisites

Before you start, make sure you have the following prerequisites:

Ubuntu Jammy HWE kernel: You need to have the Ubuntu Jammy HWE kernel installed on your system. You can check the kernel version by running the command uname -r.
Git: You need to have Git installed on your system to clone the kernel repository.
Build tools: You need to have the build tools installed on your system, including gcc, make, and kernel headers.

Step 1: Clone the Ubuntu Stock Kernel Repo

To re-compile a single module, you need to clone the Ubuntu stock kernel repository. You can do this by running the following command:

git clone git://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/jammy

This will create a new directory called jammy in your current working directory.

Step 2: Navigate to the Kernel Directory

Navigate to the kernel directory by running the following command:

cd jammy

Step 3: Checkout the Desired Kernel Version

You need to checkout the desired kernel version. You can do this by running the following command:

git checkout v6.8.0-45

Replace v6.8.0-45 with the desired kernel version.

Step 4: Configure the Kernel

To re-compile a single module, you need to configure the kernel. You can do this by running the following command:

make menuconfig

This will open the kernel configuration menu. You can navigate through the menu and select the module you want to re-compile.

Step 5: Select the Module to Re-compile

To select the module to re-compile, follow these steps:

Navigate to the Device Drivers menu.
Select the Character devices menu.
Select the Serial drivers menu.
Select the 8250/16550 and compatible serial drivers menu.
Select the 8250 serial driver module.
Go to the Device Drivers menu and select the USB support menu.
Select the USB device filesystem module.

Step 6: Save and Exit

Save and exit the kernel configuration menu by pressing Esc and then :wq.

Step 7: Re-compile the Module

To re-compile the module, run the following command:

make M=drivers/tty/serial/8250

This will re-compile the 8250 serial driver module.

Step 8: Install the New Module

To install the new module, run the following command:

sudo make M=drivers/tty/serial/usb Uinstall

This will install the new module.

Step 9: Load the New Module

To load the new module, run the following command:

sudo modprobe 8250

This will load the new module.

Conclusion

Re-compiling a single module in the Ubuntu Jammy HWE kernel can be a complex process, but with the steps outlined in this article, you should be able to do it successfully. Remember to always backup your system before making any changes to the kernel.

Troubleshooting

If you encounter any issues during the re-compilation process, you can try the following:

Check the kernel configuration menu to ensure that the module is selected.
Check the kernel build logs to ensure that the module is being re-compiled correctly.
Check the module installation logs to ensure that the module is being installed correctly.

Additional Resources

For more information on re-compiling the Ubuntu Jammy HWE kernel, you can refer to the following resources:

Ubuntu kernel documentation: https://kernel.ubuntu.com/docs/
Ubuntu kernel mailing list: https://lists.ubuntu.com/archives/ubuntu-kernel/
Ubuntu kernel bug tracker: https://bugs.launchpad.net/ubuntu/+source/linux

FAQs

Q: How do I re-compile a single module in the Ubuntu Jammy HWE kernel?

A: To re-compile a single module, you need to clone the Ubuntu stock kernel repository, navigate to the kernel directory, checkout the desired kernel version, configure the kernel, select the module to re-compile, save and exit the kernel configuration menu, re-compile the module, install the new module, and load the new module.

Q: What are the prerequisites for re-compiling a single module in the Ubuntu Jammy HWE kernel?

A: The prerequisites for re-compiling a single module in the Ubuntu Jammy HWE kernel include the Ubuntu Jammy HWE kernel, Git, and build tools.

Q: How do I troubleshoot issues during the re-compilation process?

Q: What is the Ubuntu Jammy HWE kernel?

A: The Ubuntu Jammy HWE kernel is a long-term support (LTS) kernel that provides a stable and secure environment for Ubuntu users. It is a hardware enablement (HWE) kernel that includes the latest hardware support and security patches.

Q: Why do I need to re-compile a single module in the Ubuntu Jammy HWE kernel?

A: You may need to re-compile a single module in the Ubuntu Jammy HWE kernel to fix a specific issue or to add new functionality. For example, you may need to re-compile a module to support a new hardware device or to fix a bug that is affecting your system.

Q: How do I know which module to re-compile?

A: To determine which module to re-compile, you need to identify the issue or problem you are experiencing. You can use tools such as dmesg or syslog to view system logs and identify the module that is causing the issue.

Q: What are the benefits of re-compiling a single module in the Ubuntu Jammy HWE kernel?

A: The benefits of re-compiling a single module in the Ubuntu Jammy HWE kernel include:

Improved system stability: Re-compiling a module can fix bugs and issues that are affecting your system.
Enhanced system performance: Re-compiling a module can improve system performance by optimizing code and reducing overhead.
New features and functionality: Re-compiling a module can add new features and functionality to your system.

Q: What are the risks of re-compiling a single module in the Ubuntu Jammy HWE kernel?

A: The risks of re-compiling a single module in the Ubuntu Jammy HWE kernel include:

System instability: Re-compiling a module can cause system instability if the module is not compiled correctly.
System crashes: Re-compiling a module can cause system crashes if the module is not compatible with other system components.
Data loss: Re-compiling a module can cause data loss if the module is not backed up correctly.

Q: How do I back up my system before re-compiling a single module in the Ubuntu Jammy HWE kernel?

A: To back up your system before re-compiling a single module in the Ubuntu Jammy HWE kernel, you can use tools such as tar or rsync to create a backup of your system files and configuration.

Q: How do I restore my system after re-compiling a single module in the Ubuntu Jammy HWE kernel?

A: To restore your system after re-compiling a single module in the Ubuntu Jammy HWE kernel, you can use tools such as tar or rsync to restore your system files and configuration from the backup.

Q: What are the best practices for re-compiling a single module in the Ubuntu Jammy HWE kernel?

A: The best practices for re-compiling a single module in the Ubuntu Jammy HWE kernel include:

Backup your system: Always back up your system before re-compiling a module.
Test your system: Always test your system after re-compiling a module to ensure that it is stable and functional.
Use a clean build environment: Always use a clean build environment to re-compile a module to avoid conflicts with other system components.

Q: Where can I find more information about re-compiling a single module in the Ubuntu Jammy HWE kernel?

A: You can find more information about re-compiling a single module in the Ubuntu Jammy HWE kernel by:

Referencing the Ubuntu kernel documentation: The Ubuntu kernel documentation provides detailed information about re-compiling the kernel and modules.
Searching online forums and communities: Online forums and communities such as the Ubuntu forums and the Linux kernel mailing list provide a wealth of information and resources about re-compiling the kernel and modules.
Consulting with experts: Consulting with experts in the field of kernel development and Linux system administration can provide valuable insights and guidance on re-compiling a single module in the Ubuntu Jammy HWE kernel.