gvfs-libs software package provides userspace virtual filesystem - private libraries, 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 gvfs-libs
gvfs-libs is installed in your system.
Make ensure the gvfs-libs package were installed using the commands given below,
$ sudo dpkg-query -l | grep gvfs-libs *
You will get with gvfs-libs package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Libraries |
| Package | gvfs-libs |
| Version | 1.30.1.1-1 |
| Description | userspace virtual filesystem - private libraries |
| Sub Section | Libs |