How To Upgrade Linux Kernel : Using Mainline Kernel Installer

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Upgrading the Linux kernel can be performed using distribution-specific tools like `ukuu` or by manually installing a newer kernel package. This process might sound technical, but it’s actually straightforward once you understand the steps. In this guide, you’ll learn exactly how to upgrade linux kernel safely and efficiently, whether you’re using Ubuntu, Fedora, or another distro.

The Linux kernel is the core of your operating system. It manages hardware, memory, and processes. A newer kernel can bring better performance, security fixes, and support for new hardware. But upgrading it incorrectly can break your system. That’s why you need a clear plan.

This article covers everything from checking your current kernel version to rolling back if something goes wrong. You’ll get step-by-step instructions for both beginners and advanced users. Let’s start with the basics.

Why Upgrade The Linux Kernel?

Before you learn how to upgrade linux kernel, it helps to know why you should do it. The kernel is updated frequently by the community and distributions. Each release fixes bugs, patches security vulnerabilities, and adds drivers.

For example, if you have a new graphics card or Wi-Fi adapter, the latest kernel might support it out of the box. Older kernels may lack these drivers. Upgrading can also improve system stability and speed.

However, not every upgrade is necessary. If your system runs fine, you can stick with the default kernel from your distribution. But for enthusiasts or those needing specific features, upgrading is common.

Check Your Current Kernel Version

First, you need to know what kernel you’re currently running. Open a terminal and type:

uname -r

This command shows your kernel version, like “5.15.0-91-generic”. Write it down. You’ll compare it with the new version later.

Also check your distribution’s package manager for available kernels. On Ubuntu, use:

apt list --upgradable | grep linux-image

On Fedora, use:

dnf list available kernel

This gives you an idea of what’s offered officially.

How To Upgrade Linux Kernel On Ubuntu

Ubuntu users have several options. The easiest is through the official repositories. But you can also use tools like UKUU or Mainline kernels for newer versions.

Method 1: Using Official Repositories

This is the safest method. Ubuntu’s repositories contain kernels tested for stability. Run these commands:

  1. sudo apt update
  2. sudo apt upgrade
  3. sudo apt install linux-generic

This installs the latest generic kernel from Ubuntu’s repos. Reboot after installation. Check with uname -r to confirm.

Note: This method might not give you the absolute latest kernel, but it’s reliable for most users.

Method 2: Using UKUU (Ubuntu Kernel Update Utility)

UKUU is a graphical tool that simplifies kernel upgrades. Install it first:

sudo add-apt-repository ppa:teejee2008/ppa
sudo apt update
sudo apt install ukuu

Launch UKUU from your applications menu. It shows a list of available kernels. Select the one you want and click “Install”. The tool downloads and installs it automatically.

UKUU also lets you remove old kernels easily. This is helpful for saving disk space.

Method 3: Manual Installation Of Mainline Kernels

For the latest upstream kernels, visit the Ubuntu Mainline Kernel PPA website. Download the .deb files for your architecture (amd64 for 64-bit). You need three files:

  • linux-image-*.deb
  • linux-headers-*.deb
  • linux-modules-*.deb

Install them with:

sudo dpkg -i linux-*.deb

After installation, update GRUB:

sudo update-grub

Reboot and select the new kernel from the GRUB menu.

How To Upgrade Linux Kernel On Fedora

Fedora uses the DNF package manager. The process is simpler than Ubuntu because Fedora includes newer kernels by default.

Method 1: Using DNF

Run these commands:

  1. sudo dnf update kernel
  2. Or sudo dnf upgrade to update everything.

Fedora automatically adds the new kernel to GRUB. Reboot and choose it from the menu. The old kernel remains as a fallback.

Method 2: Using RPM Fusion

For even newer kernels, enable RPM Fusion repository:

sudo dnf install https://download1.rpmfusion.org/free/fedora/rpmfusion-free-release-$(rpm -E %fedora).noarch.rpm

Then install the kernel from there:

sudo dnf install kernel

This gives you access to kernels not yet in the main repos.

How To Upgrade Linux Kernel On Arch Linux

Arch Linux is rolling release, so kernels update frequently. Use Pacman:

sudo pacman -Syu

This updates the entire system, including the kernel. If you want a different kernel (like linux-lts or linux-zen), install it:

sudo pacman -S linux-lts

Then regenerate GRUB:

sudo grub-mkconfig -o /boot/grub/grub.cfg

How To Upgrade Linux Kernel Manually (Generic Method)

If your distribution doesn’t have a package manager, or you want the absolute latest kernel from kernel.org, you can compile it yourself. This is advanced but gives full control.

Step 1: Download The Kernel Source

Go to kernel.org and download the latest stable tarball. Extract it:

tar xvf linux-*.tar.xz
cd linux-*

Step 2: Configure The Kernel

Copy your current configuration:

cp /boot/config-$(uname -r) .config

Then run:

make menuconfig

This opens a text-based menu. You can adjust settings, but defaults usually work.

Step 3: Compile And Install

Compile the kernel (this takes time):

make -j$(nproc)

Install modules:

sudo make modules_install

Install the kernel:

sudo make install

Update GRUB:

sudo update-grub

Reboot and select the new kernel.

How To Upgrade Linux Kernel Safely

Upgrading carries risks. Here are tips to avoid problems:

  • Backup your data before any kernel change.
  • Keep the old kernel in GRUB. Most distros do this automatically.
  • Test the new kernel for a few days before removing the old one.
  • Use stable kernels unless you need experimental features.
  • Check hardware compatibility with the new kernel version.

If the new kernel fails to boot, restart and choose the old kernel from GRUB. Then remove the problematic kernel.

How To Remove Old Kernels

After upgrading, you may want to clean up old kernels to save space.

On Ubuntu

sudo apt autoremove

Or use UKUU to remove them manually.

On Fedora

sudo dnf remove kernel-oldversion

List installed kernels with:

rpm -q kernel

On Arch

sudo pacman -R linux-oldversion

Always keep at least one backup kernel.

Common Issues And Fixes

Sometimes upgrades cause problems. Here are solutions:

  • Boot failure: Use GRUB recovery mode or boot from a live USB to fix.
  • Missing modules: Rebuild initramfs with sudo update-initramfs -u.
  • Graphics issues: Reinstall proprietary drivers after kernel upgrade.
  • Wi-Fi not working: Check if the kernel includes your driver; install firmware if needed.

If all else fails, revert to the old kernel and wait for a newer stable release.

How To Upgrade Linux Kernel On Raspberry Pi

Raspberry Pi uses a custom kernel. On Raspberry Pi OS, run:

sudo rpi-update

This fetches the latest kernel from the Raspberry Pi foundation. Reboot to apply.

For other distributions like Ubuntu on Pi, use the same methods as desktop Ubuntu.

How To Upgrade Linux Kernel In A Virtual Machine

Virtual machines (like VirtualBox or VMware) can also be upgraded. The process is the same as for the host system. However, you may need to reinstall guest additions after the upgrade for better performance.

Always test the new kernel in a VM before applying it to production systems.

How To Upgrade Linux Kernel Without Internet

If you’re offline, download the kernel packages on another computer and transfer them via USB. Then install locally using dpkg or rpm.

For source compilation, download the tarball and dependencies beforehand.

How To Upgrade Linux Kernel With A Script

You can automate the process with a bash script. Here’s a simple one for Ubuntu:

#!/bin/bash
sudo apt update
sudo apt install linux-generic -y
sudo update-grub
echo "Kernel upgraded. Reboot to apply."

Save it as upgrade-kernel.sh, make it executable (chmod +x upgrade-kernel.sh), and run it.

How To Upgrade Linux Kernel For Better Performance

Some kernels are optimized for specific tasks. For example, the linux-zen kernel on Arch is tuned for desktop responsiveness. On Ubuntu, you can install linux-lowlatency for audio production.

Choose a kernel that matches your workload. Gaming, server, or multimedia each benefit from different configurations.

How To Upgrade Linux Kernel And Keep Custom Modules

If you use custom kernel modules (like for hardware drivers), you need to rebuild them after each kernel upgrade. Tools like DKMS (Dynamic Kernel Module Support) automate this.

Install DKMS:

sudo apt install dkms

Then register your module with DKMS. It will rebuild automatically when the kernel changes.

How To Upgrade Linux Kernel On Embedded Systems

Embedded Linux (like on routers or IoT devices) often uses build systems like Buildroot or Yocto. Upgrading the kernel requires rebuilding the entire firmware. This is beyond this guide, but the principles are similar.

How To Upgrade Linux Kernel And Test It

After upgrading, test thoroughly:

  • Check system logs: dmesg | grep -i error
  • Test all hardware: USB, audio, network.
  • Run benchmarks if performance matters.
  • Monitor temperature and stability.

If you encounter issues, report them to your distribution’s bug tracker.

How To Upgrade Linux Kernel On A Server

Servers require extra caution. Schedule the upgrade during maintenance windows. Use a live kernel patching tool like Ksplice or Livepatch to avoid reboots.

For critical systems, test the new kernel in a staging environment first.

How To Upgrade Linux Kernel With A GUI

Some distributions offer graphical tools. Ubuntu’s “Software Updater” includes kernel updates. Fedora’s “GNOME Software” does too. But for manual control, UKUU or “Mainline Kernels” app (Ubuntu) are better.

On Linux Mint, the “Update Manager” shows kernel updates under “View -> Linux Kernels”.

How To Upgrade Linux Kernel And Revert

If the new kernel causes issues, reverting is easy. At boot, hold Shift (BIOS) or press Esc (UEFI) to open GRUB. Select “Advanced options for Ubuntu” (or your distro) and choose the old kernel.

Once booted, remove the new kernel:

sudo apt remove linux-image-5.xx.x-generic

Then update GRUB.

How To Upgrade Linux Kernel For Security

Security patches are often backported to older kernels by distributions. Always apply security updates through your package manager. For the latest fixes, use the newest stable kernel from kernel.org.

Enable automatic security updates to stay protected.

How To Upgrade Linux Kernel On A Dual-Boot System

Dual-booting with Windows doesn’t affect kernel upgrades. However, GRUB might be overwritten by Windows updates. Keep a live USB handy to reinstall GRUB if needed.

How To Upgrade Linux Kernel On A Chromebook

Chromebooks with Linux (via Crostini) use a container. The kernel is managed by Chrome OS. You cannot upgrade it directly. Instead, update Chrome OS to get a newer kernel.

How To Upgrade Linux Kernel On A Container

Containers (Docker, LXC) share the host kernel. Upgrading the host kernel affects all containers. Plan accordingly.

How To Upgrade Linux Kernel On A Live USB

Live USBs are read-only, so kernel upgrades don’t persist. Use a persistent USB or remaster the ISO to include a new kernel.

How To Upgrade Linux Kernel On A Legacy System

Older hardware may not support newer kernels. Check hardware requirements before upgrading. Some distributions offer LTS kernels for older systems.

How To Upgrade Linux Kernel On A System With Proprietary Drivers

Proprietary drivers (like NVIDIA) often break after kernel upgrades. Reinstall them after the upgrade. Use the driver’s installer or your package manager.

For NVIDIA, run:

sudo apt install nvidia-driver-xxx

Replace xxx with your version.

How To Upgrade Linux Kernel On A System With Secure Boot

Secure Boot requires signed kernels. Most distribution kernels are signed. If you compile your own, you need to sign it or disable Secure Boot.

To sign a kernel, use mokutil and sign-file. This is advanced.

How To Upgrade Linux Kernel On A System With RAID

RAID setups need special attention. Ensure the kernel includes RAID drivers. Test the new kernel with a non-RAID boot first if possible.

How To Upgrade Linux Kernel On A System With LVM

LVM is usually handled by the kernel. Upgrading should be safe, but keep a backup of your LVM configuration.

How To Upgrade Linux Kernel On A System With Encryption

Encrypted partitions (LUKS) require the kernel to support cryptsetup. Most kernels do. Test the new kernel with a live environment first.

How To Upgrade Linux Kernel On A System With Custom Initramfs

If you have custom initramfs, rebuild it after the upgrade:

sudo update-initramfs -u

How To Upgrade Linux Kernel On A System With Btrfs

Btrfs snapshots can help. Take a snapshot before upgrading. If something goes wrong, rollback to the snapshot.

How To Upgrade Linux Kernel On A System With ZFS

ZFS modules need to match the kernel. Use DKMS for