π ~1 min read
Table of contents
Symptom & Impact
System CPU stays high for long periods, affecting application latency and batch completion while unattended package work runs.
Environment & Reproduction
Seen on VMs with limited vCPU and many pending updates.
Root Cause Analysis
Large update queues, expensive trigger scripts, and overlapping timer starts can produce long high-load intervals.
Quick Triage
Confirm the process is genuine package work and not a runaway script.
Step-by-Step Diagnosis
Inspect apt history and timer cadence, then identify package scripts consuming the most time.
Solution – Primary Fix
Complete pending work during off-peak windows and tune timer behavior for predictable patch execution.
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Solution – Alternative Approaches
Disable unattended-upgrades on critical latency nodes and move updates to controlled Ansible/Salt maintenance jobs.
Verification & Acceptance Criteria
CPU returns to expected baseline and update jobs finish inside agreed maintenance durations.
Rollback Plan
Restore previous timer unit overrides if new scheduling behavior conflicts with operations policy.
Prevention & Hardening
Track patch backlog, reserve maintenance capacity, and avoid large deferred update queues.
Related Errors & Cross-Refs
Often accompanies dpkg lock contention, stale apt cache, and interrupted package postinst scripts.
Related tutorial: View the step-by-step tutorial for Ubuntu 22.04 LTS.
View all Ubuntu 22.04 LTS tutorials on the Tutorials Hub β
Browse all common problems & solutions on the Tutorials Hub.
References & Further Reading
Ubuntu unattended-upgrades and systemd timer documentation for production patch planning.
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