Download Tilix

# sudo apt-get install tilix

or install from the Pop! Shop

Download Tilix from Pop! Shop

After install, open Tilix to check the terminal application installed fine and works. If installing from the Gnome Terminal, use the following command to launch:

# tilix

Swapping Gnome Terminal for Tilix

In a terminal, run the following command:

# sudo update-alternatives --config x-terminal-emulator

From the selection presented, select the option which lists tilix.wrapper

In the selection shown below, this is option 3.

Set default terminal
Setting the default terminal

To test you have successfully changed the default to Tilix, open a terminal by pressing CTRL +Alt + T, or Super + T.