Is it possible to make Thunar my default file manager in Ubuntu 12.04 LTS?
I've installed Thunar and I must say there's really visible performance difference compared to gnome-shell default manager.
How can I make this my preferred file manager?
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The setting from Kevin Bowen's answer is not enough for all scenarios:
~$ xdg-mime query default inode/directory nautilus-folder-handler.desktop
So applications using xdg (or another interface to
.desktop files) to open directories will still use Nautilus. Run this¹ to change to Thunar:
xdg-mime default Thunar.desktop inode/directory
Note bene: using
gio mime seems to be equivalent.
By the way you need to open it just one time, after that it would be Default File Manager for you.
However, you can change the default file manager and also restore to previous one, check the link: Default File Manager Official Documentation