The compose key was working fine for me using the US keyboard with Italian characters key mapping. It worked in LightDM and it worked in Gnome. I would press RALT-E and I would get è.
Then recently it changed. LightDM still works, but when in Gnome it became two key strokes: RALT-~E. then a few days ago, one of my user IDs decided to stop working entirely. Compose key behaves like a normal ALT key. But only in one user ID; my other user ID still works.
- I have XKBOPTIONS="compose:ralt" in /etc/default/keyboard. (I think that's why LightDM works.)
- I went to the keyboard settings and tried to set the compose key. I noticed it had been set to disabled, but setting it to any key does nothing.
- In the dconf editor I have org.gnome.desktop.input-sources set to ['compose:ralt'].
What else should I look at? what files, including in $HOME, does Gnome use to determine compose key behavior??