📖 ~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

Keyboard input switches to the wrong layout after login, reboot, or app focus change.

Environment & Reproduction

Language indicator changes unexpectedly and key mapping no longer matches physical keyboard.

Root Cause Analysis

Conflicting input methods, GNOME source ordering, or stale user locale settings.

Quick Triage

Set a single default layout first and temporarily remove extra input sources.

Step-by-Step Diagnosis

Inspect gsettings for input sources, locale output, and active ibus/fcitx service state.

Illustrative mockup for ubuntu-20-04-lts — post-138-1
Illustrative mockup – Progressive Robot — Illustrative mockup — Progressive Robot

Solution – Primary Fix

Normalize input source configuration, reset user keyboard settings, and relogin to apply.

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Illustrative mockup for ubuntu-20-04-lts — post-138-2
Illustrative mockup – Progressive Robot — Illustrative mockup — Progressive Robot

Solution – Alternative Approaches

Pin preferred layout using startup scripts if desktop components keep overriding defaults.

Verification & Acceptance Criteria

Chosen keyboard layout remains persistent across sessions, apps, and reboot cycles.

Rollback Plan

Restore previous locale and input source backup if custom changes break typing behavior.

Prevention & Hardening

Avoid multiple overlapping input frameworks unless required by multilingual workflows.

Can overlap with login profile corruption, language pack issues, and desktop settings resets.

Related tutorial: View the step-by-step tutorial for Ubuntu 20.04 LTS.

View all Ubuntu 20.04 LTS tutorials on the Tutorials Hub →

Browse all common problems & solutions on the Tutorials Hub.

References & Further Reading

See Ubuntu input source configuration docs and GNOME keyboard preference references.

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