Nemo File Manager

If you aren't running Cinnamon, you can't change this in a GUI

1. Install Nemo File Manager
   • For Ubuntu

      sudo apt install nemo 

2. Install dconf-cli
   • In Ubuntu

      sudo apt install dconf-cli 

3. Run

    dconf write /org/cinnamon/desktop/applications/terminal/exec "'$terminalname'" 

   • Substitute $terminalname with command for your Terminal of choice
   • For example, for KDE Konsole the command looks like

      dconf write /org/cinnamon/desktop/applications/terminal/exec "'konsole'" 

   • For xfce4-terminal it looks like

      dconf write /org/cinnamon/desktop/applications/terminal/exec "'xfce4-terminal'" 

Source: https://forums.linuxmint.com/viewtopic.php?t=365476