Im using the terminator terminal with the keyboard shortcut Control+Shift+E for splitting the terminal. I got used to this shortcut.

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Read more Show archive.org snapshot

Yesterday the Ubuntu update seems to have upgraded ibus, which got this emoji picker Show archive.org snapshot that also uses Control+Shift+E to open.
You can change this behaviour by opening the ibus setup from the console:

ibus-setup

A window will open and you can delete the shortcut in the emoji tab (Emoji => ... => detele). You're not gonna use it anyway, are you?