I have Ubuntu 13.10 installed with the default window manager and DE.
I am trying to enable single click so I can open files and folders with only one click. I tried googling and all results said to open Files, then go to Preferences from the top bar, but my top bar has no options.
Here is a picture of my desktop:
For 13.10 Go to files then click on Preferences
Then
For 14.04 Go to files, then click on Edit --> Preferences
Click on the Behavior Tab, and then click on Single Click to open items. See image below
Try
sudo apt-get install --reinstall nautilus