π ~1 min read
Table of contents
Symptom & Impact
Kernel update fails and bootloader state becomes inconsistent, risking reboot failures.
Environment & Reproduction
Ubuntu 20.04 LTS on BIOS or UEFI hosts with storage layout changes.
Root Cause Analysis
GRUB target device or EFI mount path is incorrect during package scripts.
Quick Triage
Confirm current boot mode and identify active boot device mapping.
Step-by-Step Diagnosis
Inspect grub package logs, EFI mount status, and disk partition flags.
Solution – Primary Fix
Reinstall GRUB to the correct target and rerun kernel package configuration.
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Solution – Alternative Approaches
Use rescue media chroot to repair bootloader when system scripts cannot complete.
Verification & Acceptance Criteria
Kernel packages configure cleanly and system boots after controlled reboot.
Rollback Plan
Restore boot partitions from backup and recover with known-good boot media.
Prevention & Hardening
Document boot architecture and validate EFI mounts before major updates.
Related Errors & Cross-Refs
Often paired with initramfs generation warnings and dpkg interrupted state.
Related tutorial: View the step-by-step tutorial for Ubuntu 20.04 LTS.
View all Ubuntu 20.04 LTS tutorials on the Tutorials Hub β
Browse all common problems & solutions on the Tutorials Hub.
References & Further Reading
Review GRUB docs, Ubuntu server boot repair guidance, and kernel package docs.
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