Fix Nautilus Thumb Generation on Ubuntu 24.04

  • Relax the security restriction (immediate fix): Open your terminal and run: sudo sysctl -w kernel.apparmor_restrict_unprivileged_userns=0
  • Clear the "failed" thumbnail cache: This forces Nautilus to retry generating thumbnails for files that previously failed: rm -rf ~/.cache/thumbnails/fail/*
  • Restart the file manager: Close all Nautilus instances to apply the changes: nautilus -q

Meta

Created:

Updated: 2026-04-25 16:04