🟠 High   ⏱ 5–30 min  Last verified: 19 May 2026
Affected versions: Ubuntu 24.04 LTS Ubuntu 24.04 Ubuntu 24.04.1

📖 ~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 updates cannot complete bootloader writes, risking unbootable state.

Environment & Reproduction

Seen on systems with small ESP and many stale loader entries.

df -h /boot/efi
ls -lah /boot/efi/EFI

Root Cause Analysis

EFI partition has insufficient free space for new boot artifacts.

Quick Triage

Check ESP utilization and existing vendor directories.

sudo du -h /boot/efi/EFI | sort -h | tail

Step-by-Step Diagnosis

Review installer error logs and current EFI entries.

sudo efibootmgr -v
sudo journalctl -p err -n 80 --no-pager
Illustrative mockup for ubuntu-24-04-lts — terminal_or_console
Diagnosis commands for post 161 — Illustrative mockup — Progressive Robot

Solution – Primary Fix

Clean obsolete EFI files safely and reinstall GRUB.

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sudo rm -rf /boot/efi/EFI/
sudo grub-install
sudo update-grub
Illustrative mockup for ubuntu-24-04-lts — log_or_dashboard
Fix validation evidence for post 161 — Illustrative mockup — Progressive Robot

Solution – Alternative Approaches

Resize ESP during maintenance if recurring space pressure persists.

lsblk -f

Verification & Acceptance Criteria

grub-install and update-grub complete without write errors.

sudo grub-install
sudo update-grub

Rollback Plan

Restore backed up EFI files if boot entry becomes invalid.

sudo cp -a /root/efi-backup/* /boot/efi/EFI/

Prevention & Hardening

Audit ESP usage after kernel maintenance and remove obsolete entries regularly.

df -h /boot/efi

Related to grub-install cannot copy and no space left on device messages.

Related tutorial: View the step-by-step tutorial for Ubuntu 24.04 LTS.

View all Ubuntu 24.04 LTS tutorials on the Tutorials Hub →

Browse all common problems & solutions on the Tutorials Hub.

References & Further Reading

Ubuntu UEFI bootloader and GRUB administration references.

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