🟑 Medium   ⏱ 5–30 min  Last verified: 20 May 2026
Affected versions: Ubuntu 26.04 LTS

πŸ“– ~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

Boot delays or fails due to NFS mounts attempting before network is fully ready.

Environment & Reproduction

Typical with static fstab NFS entries on fast-boot cloud VMs.

systemd-analyze critical-chain remote-fs.target

Root Cause Analysis

Mount units lack proper network-online dependency and timeout tuning.

Quick Triage

Inspect fstab options and mount unit failure logs.

grep nfs /etc/fstab
systemctl status remote-fs.target
journalctl -b -u remote-fs.target --no-pager

Step-by-Step Diagnosis

Confirm network-online readiness and test manual mount latency.

systemctl status systemd-networkd-wait-online NetworkManager-wait-online
sudo mount -av
showmount -e
Illustrative mockup for ubuntu-26-04-lts β€” nfs_boot_timeout
NFS mount timeout during boot β€” Illustrative mockup β€” Progressive Robot

Solution – Primary Fix

Apply _netdev and automount options with realistic timeout/retry values.

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sudoedit /etc/fstab
# example: :/export /mnt/data nfs defaults,_netdev,x-systemd.automount,x-systemd.device-timeout=30,timeo=600,retrans=2 0 0
sudo systemctl daemon-reload
sudo mount -av
Illustrative mockup for ubuntu-26-04-lts β€” nfs_boot_dependency_fixed
Adjusted mount dependencies and successful NFS mount β€” Illustrative mockup β€” Progressive Robot

Solution – Alternative Approaches

Use dedicated .mount/.automount unit files for advanced dependency control.

systemctl cat mnt-data.mount 2>/dev/null || true

Verification & Acceptance Criteria

System boots without remote-fs delay and NFS becomes available on demand.

systemd-analyze blame | head -n 20
mount | grep nfs

Rollback Plan

Restore previous fstab entries and reload systemd mount units.

sudo cp /etc/fstab.bak /etc/fstab
sudo systemctl daemon-reload
sudo mount -av

Prevention & Hardening

Test network-dependent mounts under reboot scenarios before production rollout.

Related to DNS delays and stale NFS file handle incidents.

Related tutorial: View the step-by-step tutorial for Ubuntu 26.04 LTS.

View all Ubuntu 26.04 LTS tutorials on the Tutorials Hub β†’

Browse all common problems & solutions on the Tutorials Hub.

References & Further Reading

Ubuntu NFS client and systemd mount dependency documentation.

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