Ubuntu – Which keyboard setting corresponds to “United States (International)” in Windows XP

I personally use the English (International AltGr dead keys) layout on an english keyboard. I type mostly stuff in english but also need accents and special characters for spanish, and occasionally some french. I've found this layout the best, really versatile for most accented character needs and saves me from constantly switching layouts which I consider very distracting :

• All keys work as marked on the keyboard
• When you need a special character, press AltGr (right Alt key) in combination with a letter or symbol. For instance, AltGr+vowel = accented vowel (áéíóú). AltGr+n = ñ.
• You can "compose" by pressing, for instance, AltGr+6 and a vowel (circumflex, like ê), or AltGr+` and a vowel (grave accent, è), or AltGr+" and a vowel for diaeresis (ü).
• AltGr+! = ¡ and AltGr+? = ¿
• Many more useful mappings, here's a full keyboard map:
• You can get this keyboard map on your computer, go to Keyboard Layouts, select a layout, and click on the little keyboard icon (last icon on the right, below the layouts list). This will help you get acquainted with the layout.

Getting used to pressing two keys for accented letters is a bit strange, but it's doable (took me about a week to get up to speed).

I used 'international with AltGr dead keys' or something like that in 16.04. I could keep the right Alt key depressed to add an accent to just a single letter, and have , ' and " work normally otherwise.

In 18.04 it seems hidden. In "Region & Language" I selected a US keyboard first, and then I could add the "English (intl. with AltGr dead keys)" - after which I could remove the plain US keyboard.

Note that I also moved from IBus to XIM method (it's under Manage Installed Languages - ???) while I did that - no idea if that helped with this change, but I could change it back to IBus anyway.