π ~1 min read
Table of contents
Symptom & Impact
Kernel and initramfs package updates fail because /boot has no free space.
Environment & Reproduction
Most common on small boot partitions with many retained kernel versions.
Root Cause Analysis
Old kernels accumulate faster than cleanup policies remove them.
Quick Triage
Identify running kernel and list removable obsolete images.
Step-by-Step Diagnosis
Inspect /boot consumption and verify safely removable package set.
Solution – Primary Fix
Purge old kernels, regenerate initramfs, and complete pending package jobs.
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Solution – Alternative Approaches
Manually purge specific obsolete kernel versions if autoremove misses them.
Verification & Acceptance Criteria
Free space is restored and kernel package updates complete successfully.
Rollback Plan
Boot into a known-good kernel from GRUB if runtime regression appears.
Prevention & Hardening
Run periodic autoremove and monitor /boot utilization thresholds.
Related Errors & Cross-Refs
Related to mkinitramfs failures and dpkg no space left on device.
Related tutorial: View the step-by-step tutorial for Ubuntu 22.04 LTS.
View all Ubuntu 22.04 LTS tutorials on the Tutorials Hub β
Browse all common problems & solutions on the Tutorials Hub.
References & Further Reading
Ubuntu 22.04 kernel lifecycle and package cleanup guidance.
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