iBus binds ctrl + alt + e to enter emoji, but it is quite annoying actually. I did not enter emoji on Ubuntu. More importantly, it collides with the vscode shortcut.
So, how to disable it.

Method 1
In terminal type ibus-setup
, go to the emoji
tab, and delete the keybindings.

But for some reason, it may not work in VSCode.
https://github.com/Microsoft/vscode/issues/48480
Method 2
- Open terminal
- enter
gsettings set org.freedesktop.ibus.panel.emoji hotkey [] - Done