directorykeyboardnautilusshortcut-keys
In Nautilus tree-view, pressing * (asterisk) expands the selected directory structure by ONE level.
Pressing * again will expand the structure by one more level.
…etc, etc, untl all levels are expanded.
Is there some way to expand ALL levels in just a single action?.
There is an upstream bug about this, but unfortunately it's open since 2003 and probably won't receive a fix in the near future.
Don't know if there's a Nautilus script that allows you to expand/collapse all folders.
What does work, is to expand directories "level-by-level" by using the asterisk (*) multiple times (first time it expands all subdirectories, second time all subdirectories of subdirectories, etc.) - it's close to what you want, but admittedly not optimal.
This happens because in Natty Super/Mod4 is a shortcut to the Unity panel. You can change that in Compiz.
Install the compizconfig-settings-manager
package.
Hit Alt+F2, type about:config and hit Enter to open the Unity configuration.
Change the shortcut for Key to show the launcher as you like to free your Super key:
In this example I've changed from Super to Super + L
Now your mod key is free to use as you like.
Best Answer
I'd suggest this is by design - if I click on File System then expand all branches this could take a huge amount of time, especially if I have NFS shares mounted, or similar. Or even worse - if I have a FUSE filesystem mounted, like sshfs, and Nautilus wants it to expand the entire subtree... not good.