gscan2pdf software package provides GUI to produce PDFs or DjVus from scanned documents, 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 gscan2pdf
gscan2pdf is installed in your system.
Make ensure the gscan2pdf package were installed using the commands given below,
$ sudo dpkg-query -l | grep gscan2pdf *
You will get with gscan2pdf package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Utilities |
| Package | gscan2pdf |
| Version | 1.5.5-1 |
| Description | GUI to produce PDFs or DjVus from scanned documents |
| Sub Section | Utils |