If you want to install a drop-down terminal in Linux Mint / Ubuntu, install Guake. It’s a really cool Quake style terminal for Linux users. Here’s how to install and use it in Linux Mint / Ubuntu:
1. Issue the following command at the terminal-
sudo apt-get install guake
2. After the installation is complete, click on ‘Menu>Accessories>Guake Terminal’ to launch the application.
3. An icon will appear in the system tray.
Press the hotkey ‘F12’ to show / hide Guake terminal.