Ubuntu 26.04 LTS – DKMS module build fails after kernel update – Fix & Prevention

📖 ~1 min read

Table of contents

1. Symptom & Impact
2. Environment & Reproduction
3. Root Cause Analysis
4. Quick Triage
5. Step-by-Step Diagnosis
6. Solution – Primary Fix
7. Solution – Alternative Approaches
8. Verification & Acceptance Criteria
9. Rollback Plan
10. Prevention & Hardening
11. Related Errors & Cross-Refs
12. References & Further Reading

Symptom & Impact

Custom drivers fail to load after reboot, impacting GPU, network, or virtualization features.

Environment & Reproduction

Appears when new kernel headers mismatch module source expectations.

sudo dkms status
uname -r
sudo apt upgrade -y

Root Cause Analysis

Module source lacks compatibility with updated kernel ABI or missing header packages.

Quick Triage

Check dkms status and recent build errors.

sudo dkms status
sudo journalctl -k -n 100
ls /var/lib/dkms

Step-by-Step Diagnosis

Inspect module make logs and verify headers for running kernel.

sudo cat /var/lib/dkms///build/make.log | tail -n 80
sudo apt install -y linux-headers-$(uname -r)
dpkg -l | grep linux-headers

Solution – Primary Fix

Install required headers and rebuild DKMS modules for active kernel.

sudo apt install -y build-essential dkms linux-headers-$(uname -r)
sudo dkms autoinstall
sudo modprobe 

Solution – Alternative Approaches

Pin to stable kernel version until vendor module supports latest ABI.

sudo apt-mark hold linux-image-generic linux-headers-generic

Verification & Acceptance Criteria

Module loads without errors and dependent hardware/service works.

lsmod | grep 
dmesg | tail -n 50

Rollback Plan

Boot prior kernel and reinstall previous working module package.

uname -r
sudo apt install -y =

Prevention & Hardening

Track DKMS compatibility before kernel rollout and stage updates.

Automate patch management and compliance across your fleet with our DevOps services.

sudo dkms status
apt-cache policy linux-generic

Related Errors & Cross-Refs

Linked to secure boot module signing issues and missing compiler toolchains.

Related tutorial: View the step-by-step tutorial for Ubuntu 26.04 LTS.

View all Ubuntu 26.04 LTS tutorials on the Tutorials Hub →

Browse all common problems & solutions on the Tutorials Hub.

References & Further Reading

Ubuntu DKMS and kernel header management documentation.