Install appstream-util by entering the following commands in the terminal:
sudo apt update sudo apt install appstream-util
Utility to work with AppStream metadata
AppStream is a cross-distribution effort for creating and sharing metadata about software components available in the package repositories of a distribution. . This package provides an utility to work with AppStream metadata, which uses libappstream-glib. . It also contains Autotools macros to easily integrate AppStream metadata into an Autotools-based buildsystem, by running 'appstream-util' to validate the files before installing them.