Quick follow-up based on further testing: After applying the workaround described here, thumbnail generation itself appears to be working correctly again at a system level.
Both Nemo and Nautilus are now able to display thumbnails reliably, which suggests that the underlying thumbnailing pipeline (including cache population in ~/.cache/thumbnails) is functioning as expected. However, there still seems to be an inconsistency: The GTK file chooser (e.g. in Firefox Flatpak) continues to show missing or placeholder thumbnails for many files, even though valid thumbnails already exist and are correctly displayed by file managers. This suggests that the original issue may have had two aspects: 1) Thumbnail generation being blocked (now resolved by the workaround) 2) Thumbnail consumption / reuse behaving inconsistently in the GTK file chooser I have opened a separate bug to track this remaining inconsistency: https://bugs.launchpad.net/ubuntu/+source/xdg-desktop-portal/+bug/2148248 From a user perspective, the system now behaves inconsistently depending on the application, despite a fully working thumbnail cache. Let me know if you would prefer this to be tracked differently or linked elsewhere. -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to nautilus in Ubuntu. https://bugs.launchpad.net/bugs/2148075 Title: Nautilus incorrectly marks thumbnails as failed although thumbnailers work correctly To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/nautilus/+bug/2148075/+subscriptions -- desktop-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
