Are you using a non-English keyboard layout? Try running the following command and selecting the correct layout:

sudo dpkg-reconfigure console-data

You may need to install the console-data package first:

sudo apt-get install console-data

I install and reconfigure de console-data but cant still write /, i'm working on a macbook pro. Any idea why?

I'm using de qwerty configuration and Latin American, I try with Spanish- Apple USB and nothing!!!!

Some help