One of the annoying things about using Ubuntu over VNC when you first set it up, is trying to type only to find some letters do things like minimize the windows which is rather unhelpful when you’re trying to type something into a window.
To fix this, you need to change the “Super Key Bindings”. This is actually a feature, not a bug. For some reason the Ubuntu developers though it would be a good idea to map keys through to different actions by default.
You’ll need to modify the following file: “10-nosuperkey-settings”
# This file is a site config file to disable “Super/Windows” key bindings
# so that vnc clients can operate properly.
# use “dconf update” to incorporate into db the first time