I am trying to use custom compose key sequences and have read that I need XIM for it (or UIM). The problem is, Compose Sequences stop working altogether when using it. The side effect that it disables ctrl+shift+u unicode entering is supposed to only apply to XIM, so I also tried UIM, but that also has the issue while still not working. I am using Linux Mint 19.1
Can anyone help me to get custom compose key sequences to work?