Right ALT key doesn't work

[Jeff Co]

Hello,
My left ALT key works, but my Right ALT key doesn't work, or at least, 
doesn't do what a usual alt key does. I took a look at 
Preferences-->Keyboard-->Layout Options tab, and there is nothing about ALT 
keys that has been marked. I even tried turning every option off in this tab 
and still nothing changed.

Is this a normal thing with Ubuntu, or is my keyboard busted? How can I test 
out if my Right ALT key is physically okay? 

thank you.
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