Ubuntu 26.04 LTS DKMS Module Build Fails After Kernel Update

📖 ~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

Kernel update completes but required modules (e.g., drivers) fail to build, reducing functionality after reboot.

Environment & Reproduction

Appears on systems using out-of-tree modules managed by DKMS.

sudo dkms status

Root Cause Analysis

Missing matching headers or module source incompatibility with the new kernel ABI.

Quick Triage

Confirm running kernel and available header package versions.

uname -r && apt list --installed | grep linux-headers

Step-by-Step Diagnosis

Read DKMS build logs for compiler and symbol errors.

sudo cat /var/lib/dkms/*/*/build/make.log

Solution – Primary Fix

Install exact headers and rebuild DKMS modules for the active kernel.

sudo apt install --reinstall linux-headers-$(uname -r) build-essential dkms && sudo dkms autoinstall

Solution – Alternative Approaches

Boot previous working kernel until upstream module patch or compatible driver version is available.

Verification & Acceptance Criteria

`dkms status` shows installed modules for the target kernel and features function after reboot.

Rollback Plan

Select prior kernel from GRUB and purge newly failed module build artifacts if necessary.

Prevention & Hardening

Test DKMS modules in staging before broad kernel rollout and pin known-good versions.

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

Related Errors & Cross-Refs

Associated with secure boot module signing failures and `modprobe` unresolved symbol errors.

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, kernel header, and third-party module maintenance guidance.