🟡 Medium   ⏱ 5–30 min  Last verified: 20 May 2026

📖 ~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

After reboot, hardware features or virtualization drivers stop working because kernel modules did not rebuild.

Environment & Reproduction

Seen on Ubuntu 16.04 with third-party drivers (for example VirtualBox/NVIDIA) after unattended kernel upgrades.

Root Cause Analysis

DKMS cannot compile modules against the new kernel due to missing headers, compiler mismatch, or module source incompatibility.

Quick Triage

Check dkms status and inspect /var/lib/dkms/*/build/make.log. Compare running kernel with uname -r and installed headers list.

Step-by-Step Diagnosis

Validate linux-headers-$(uname -r) and build-essential packages, then inspect compiler versions and module source patches needed for xenial kernels.

Illustrative mockup for ubuntu-16-04-lts — ubuntu1604-b01-p16-diagnosis
dkms status shows module build failure — Illustrative mockup — Progressive Robot

Solution – Primary Fix

Install matching linux headers and required toolchain, then rebuild with sudo dkms autoinstall or specific dkms build/install commands.

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Illustrative mockup for ubuntu-16-04-lts — ubuntu1604-b01-p16-fix
matching linux-headers installed and dkms rebuilt — Illustrative mockup — Progressive Robot

Solution – Alternative Approaches

Boot previous known-good kernel from GRUB, pin kernel updates temporarily, or switch to in-tree kernel modules where possible.

Verification & Acceptance Criteria

dkms status reports installed for active kernel, module loads via modprobe, and dependent functionality is restored.

Rollback Plan

Reboot into prior kernel, remove newly installed incompatible module package versions, and restore pinned kernel policy.

Prevention & Hardening

Gate kernel rollouts with DKMS build tests, keep module sources updated, and monitor failed dkms jobs in patch automation.

Often paired with initramfs warnings and postinst script failures during apt upgrade.

Related tutorial: View the step-by-step tutorial for Ubuntu 16.04 LTS.

View all Ubuntu 16.04 LTS tutorials on the Tutorials Hub →

Browse all common problems & solutions on the Tutorials Hub.

References & Further Reading

dkms(8), Ubuntu kernel package docs, and vendor module compatibility matrices for xenial kernels.

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