I'm trying to solve the problem on How to type @ on a MacBookPro 2.1 but Keyboard in settings doesn't show an Options button like pictured on the screenshot.
What workaround is there to this issue?
In Loki 0.4.1 to enable to type @ on a MacbookPro 2,1 in Keyboard -> Layout -> key to choose 3rd level's choices did not include 'left alt', then the issue can be solved attributing it to 'caps lock', providing I'm using the GUI a lot I'm not using 'caps lock' frequently at all, so it's a working choice.
It should be possible to put it on Left-Alt like this: open terminal and put:
sudo dpkg-reconfigure keyboard-configuration
An setup starts with a Keyboard-configuration, the 4th screen is the 3rd-level option for me, I was able to choose left Alt here (not on a Macbook) Finish the setup than put:
service keyboard-setup restart
And it should work!
PS: Sometimes this change isn't permanent (gone at restart), write back if that's the case.