How can I type the "at" @ symbol on a Spanish keyboard?

I just finished installing Ubuntu on my AMD Athlon, but I cannot type the "at" sign. I'm from Peru and my Keyboard is Spanish. I have tried using Alt+64, Ctrl+Alt+2, Ctrl+Alt+Q, but nothing happens.
Please help.

The unicode character entry keyboard sequence is Ctrl+Shift+U hex value Enter so the @ sign would be Ctrl+Shift+U 40 Enter.

You might want to check the keyboard locale settings in the keyboard layout pane of the settings center to make sure you have the right layout.

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The @ is on the '2' key on a Spanish keyboard. Do this: Alt + gr (near the space bar) and the 2 key.

Similar to this is '€': Alt + gr + E

The there is:

• á
• é
• í
• ó
• ú

To do this, near return the is ç to the left of this key is ´¨.
Press once then the appropriate vowel.