The rest of the world knows this as "Alt Gr" - i.e. the right Alt key is used as a sort of secondary Shift key to access less-common characters. For instance, on a UK keyboard layout, AltGr+4 is the Euro symbol. However, apparently this isn't so usual in US layouts, so the defaults will need to be adjusted a bit.
-- right Alt key not recognized by default https://launchpad.net/bugs/76901 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
