gdisk software package provides GPT fdisk text-mode partitioning tool, 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 gdisk
gdisk is installed in your system.
Make ensure the gdisk package were installed using the commands given below,
$ sudo dpkg-query -l | grep gdisk *
You will get with gdisk package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Administration Utilities |
| Package | gdisk |
| Version | 0.8.10-2 |
| Description | GPT fdisk text-mode partitioning tool |
| Sub Section | admin |