grub-legacy-ec2 software package provides virtual package provided by pv-grub-menu, 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 grub-legacy-ec2
grub-legacy-ec2 is installed in your system.
Make ensure the grub-legacy-ec2 package were installed using the commands given below,
$ sudo dpkg-query -l | grep grub-legacy-ec2*
You will get with grub-legacy-ec2 package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Virtual packages |
| Package | grub-legacy-ec2 |
| Version | |
| Description | virtual package provided by pv-grub-menu |
| Sub Section | Virtual |