Install avogadro-data by entering the following commands in the terminal:
sudo apt update sudo apt install avogadro-data
Molecular Graphics and Modelling System (Data Files)
Avogadro is a molecular graphics and modelling system targeted at molecules and biomolecules. It can visualize properties like molecular orbitals or electrostatic potentials and features an intuitive molecular builder. . This package contains data files like molecular builder fragments or OpenGL shaders.