Black Box is a free and open source terminal emulator application for Linux. It will work well on GNOME systems. You can make this terminal app more beautiful with build-in color schemes and themes. It also comes with an option to hide headerbar and menu buttons, show floating controls, set font, cursor and paste file paths by dragging them into the window. It is written in Vala and uses GTK 4, libadwaita, VTE and released under GNU General Public License v3.0.
How to Install BlackBox Terminal on Ubuntu Linux
BlackBox Terminal is available as a flatpak package file. So you need to install the latest version of flatpak and remote flathub on your system first. After the installation restart your Linux system. Now in the terminal console app run Black Box flatpak install command.
flatpak install flathub com.raggesilver.BlackBox
After the successful installation of Black Box terminal emulator, start it with below command.
flatpak run com.raggesilver.BlackBox
And you can uninstall it via
sudo flatpak uninstall com.raggesilver.BlackBox