Hot answers tagged nautilus
I'm pretty sure Nautilus can show a folder tree in it's side pane, it's switchable between the "Places" or a tree (maybe other options too). http://askubuntu.com/a/339138 [May even be a duplicate Q] As can Thunar (XFCE file manager)
I'd recommend Thunar. You can get the tree view in the side panel by just setting this mode in View -> Side Pane -> Tree:
if You uninstalled Totem player then just install it again (even if You are not using it). If You have it already installed, then I would suggest to reinstall it. After that check if thumbnails are working, if not check: /usr/share/thumbnailers/totem.thumbnailer it should contain something like this: [Thumbnailer Entry] ...
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