gfxboot-dev software package provides tool to test and create graphical boot logos (development), you can install in your Debian 9 (Stretch) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install gfxboot-dev
gfxboot-dev is installed in your system.
Make ensure the gfxboot-dev package were installed using the commands given below,
$ sudo dpkg-query -l | grep gfxboot-dev *
You will get with gfxboot-dev package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Miscellaneous |
| Package | gfxboot-dev |
| Version | 4.5.2-1.1-5 |
| Description | tool to test and create graphical boot logos (development) |
| Sub Section | Miscellaneous |