I installed the Unity desktop environment in Ubuntu 18.04 and even though everything is working properly, the Terminator app is not being included in the application switcher, making it unreachable by simple pressing Alt+Tab back. It does still appear along with other windows when using Super+W, which is being the way I have to reach it back.
Its icon does not appear in the side navigation bar (Unity Launcher).
It works properly when using the default GNOME desktop environment.