No matter what I do the result is there no image/video thumbnails
$ thunar --version
Thunar 1.6.15 (Xfce 4.12)
$ sudo apt install tumbler tumbler-plugins-extra ffmpegthumbnailer
Reading package lists... Done
Building dependency tree
Reading state information... Done
ffmpegthumbnailer is already the newest version (2.1.1-0.1build1).
tumbler is already the newest version (0.2.1-0ubuntu1).
tumbler-plugins-extra is already the newest version (0.2.1-0ubuntu1).
0 upgraded, 0 newly installed, 0 to remove and 2 not upgraded.
$ mv ~/.config/Thunar ~/.config/Thunar.bak
also enabled thumbnails in thunar: