Install xdg-desktop-portal-dev by entering the following commands in the terminal:
sudo apt update sudo apt install xdg-desktop-portal-dev
Description:
desktop integration portal for Flatpak - development files
xdg-desktop-portal provides a portal frontend service for Flatpak, and possibly other desktop containment/sandboxing frameworks. This service is made available to the sandboxed application, and provides mediated D-Bus interfaces for file access, URI opening, printing and similar desktop integration features. See the xdg-desktop-portal package's description for more details. . This package contains development files for backends such as xdg-desktop-portal-gtk.
Homepage: http://flatpak.org/
Version: 0.11-1
Section: universe/admin