📖 ~1 min read
Table of contents
Symptom & Impact
Kernel upgrades fail and bootloader updates stop, increasing reboot risk after patching.
Environment & Reproduction
Common on small dedicated /boot partitions with many retained kernels.
Root Cause Analysis
Insufficient free space in /boot prevents initrd and grub artifacts from being generated.
Quick Triage
Determine active kernel and removable old kernel packages.
Step-by-Step Diagnosis
Correlate package manager failures with /boot space and artifact counts.
Solution – Primary Fix
Remove old kernels safely, then rerun package and grub configuration.
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Solution – Alternative Approaches
Expand /boot where possible or reduce kernel retention policies.
Verification & Acceptance Criteria
Kernel packages configure successfully and grub update completes without space errors.
Rollback Plan
Reinstall required kernels from cache/repository if cleanup removed a needed image.
Prevention & Hardening
Implement regular kernel cleanup and /boot capacity monitoring.
Related Errors & Cross-Refs
Related messages include No space left on device and update-initramfs failure.
Related tutorial: View the step-by-step tutorial for Debian 10.
View all Debian 10 tutorials on the Tutorials Hub →
Browse all common problems & solutions on the Tutorials Hub.
References & Further Reading
Debian kernel package management and grub maintenance docs.
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