Parece que os ajustes elementares não têm mais ligações de teclas no Freya elementar. Mas, felizmente, há um modo de ligar as chaves em Freya também. Você pode usar o programa chamado xbindkeys. Detalhes sobre como configurá-lo e usá-lo, você pode encontrar aqui .
trecho
We only need xbindkeys, a simple yet powerful command line tool to bind commands to a certain key or keys combinations. The program can be installed via terminal typing:
$ sudo apt-get install xbindkeys
After the installation, if you try to run the application, you will be warmed to create a configuration file. As user, type:
$ touch ~/.xbindkeysrc
or, alternatively:
$ xbindkeys --defaults > ~/.xbindkeysrc
Then edit the file:
$ nano ~/.xbindkeysrc
And type, before the end section:
"slingshot-launcher" Super_L
so it will look like this:
xbindkeys
Then press CTRL+X to save and exit.
Of course, xbindkeys can be used to bind also different commands to different keys. The values are written as:
"command" state (0x8) and keycode (32) keysyms associated with the given keycodes
To find the last two values (which, as we’ve seen, can be used indifferently), type
$ xbindkeys -k
then, in the blank window that’ll be open, type the key or the desired keys combination. The result will appear in the terminal.