Ubuntu 26.04 LTS – GNOME Shell memory usage grows continuously

📖 ~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

Administrators observe: Ubuntu 26.04 LTS – GNOME Shell memory usage grows continuously. Desktop responsiveness degrades over long sessions.

Environment & Reproduction

Issue appears with specific extensions, long uptime, or graphics stack regressions.

# Baseline context
lsb_release -a
loginctl
ps -eo pid,cmd,%mem --sort=-%mem | head
gsettings get org.gnome.shell enabled-extensions
sudo journalctl -b -p warning --no-pager | tail -n 120

Root Cause Analysis

Extension leaks, compositor bugs, or driver interactions can cause sustained memory growth in gnome-shell process.

Quick Triage

Measure growth rate and isolate extensions.

# Quick triage
watch -n 5 "ps -C gnome-shell -o pid,%mem,rss,cmd"
gnome-extensions list
gnome-extensions info  || true

Step-by-Step Diagnosis

Disable extensions in batches and compare memory behavior.

# Detailed diagnosis
for e in $(gnome-extensions list); do gnome-extensions disable "$e"; done
# Re-enable selectively
ps -C gnome-shell -o pid,%mem,rss,cmd
sudo journalctl --user -u [email protected] -n 120 --no-pager || true

Solution – Primary Fix

Update desktop packages and keep only validated extensions enabled.

# Primary fix
sudo apt-get update
sudo apt-get upgrade -y
for e in $(gnome-extensions list); do gnome-extensions disable "$e"; done
# Enable approved extensions only
reboot

Solution – Alternative Approaches

Switch session type or display manager if leak is specific to current compositor path.

# Alternative
cat /etc/gdm3/custom.conf | sed -n '1,120p'
# Toggle WaylandEnable and test next login

Verification & Acceptance Criteria

Memory stabilizes over normal session duration and desktop remains responsive.

# Verify
ps -C gnome-shell -o pid,%mem,rss,cmd
free -h
sudo journalctl -b -p err --no-pager | tail -n 60

Rollback Plan

Re-enable previous extension set if workflow impact outweighs leak reduction.

# Rollback
# Re-enable extensions individually
gnome-extensions enable 

Prevention & Hardening

Control extension inventory and validate desktop updates in pilot groups.

# Hardening
gnome-extensions list
sudo apt-mark showhold | grep -i gnome || true

Related Errors & Cross-Refs

Related patterns include shell restarts, compositor stutter, and high swap usage over time.

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

View all Ubuntu 26.04 LTS tutorials on the Tutorials Hub →

Browse all common problems & solutions on the Tutorials Hub.

References & Further Reading

GNOME extension management docs and Ubuntu desktop troubleshooting guides.