I recently re-installed Xubuntu 18.04. After re-installation thumbnails stopped loading after some time. At first it loaded a few thumbnails and stopped, but it even stopped showing the loaded thumbnails after I restarted the PC.
I attempted few things like -
sudo apt install tumbler ffmpegthumbnailer gstreamer0.10 killall thunar sudo rm -rf ~/.thumbnails/ mv ~/.config/Thunar ~/.config/Thunar.bak sudo update-mime-database /usr/share/mime thunar -q
still thumbnails are not showing.