π ~1 min read
Table of contents
Symptom & Impact
System fails normal boot and lands in emergency shell due to mount failures.
Environment & Reproduction
Triggered by invalid UUIDs, options, or unavailable devices in fstab entries.
Root Cause Analysis
Critical mount units fail during boot sequence because fstab metadata is incorrect.
Quick Triage
Access emergency shell, identify failed units, and inspect fstab syntax quickly.
Step-by-Step Diagnosis
Validate filesystem identifiers, mount options, and dependency ordering.
Solution – Primary Fix
Correct or comment invalid fstab lines, regenerate initramfs if needed, and reboot.
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Solution – Alternative Approaches
Use nofail and proper timeout options for non-critical or removable mount points.
Verification & Acceptance Criteria
System boots to target runlevel with all required filesystems mounted successfully.
Rollback Plan
Restore previous fstab from rescue media or recovery snapshot backup.
Prevention & Hardening
Test fstab changes with mount -a in maintenance windows before reboot.
Related Errors & Cross-Refs
Dependency failed for local filesystems and gave up waiting for device.
Related tutorial: View the step-by-step tutorial for Ubuntu 18.04 LTS.
View all Ubuntu 18.04 LTS tutorials on the Tutorials Hub β
Browse all common problems & solutions on the Tutorials Hub.
References & Further Reading
systemd mount units, fstab options, and Ubuntu emergency boot recovery guides.
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