Install libavogadro1 by entering the following commands in the terminal:
sudo apt update sudo apt install libavogadro1
Description:
Molecular Graphics and Modelling System (library)
Avogadro is a molecular graphics and modelling system targeted at small to medium molecules. It can visualize properties like molecular orbitals or electrostatic potentials and features an intuitive molecular builder. . This package provides the shared library.
Homepage: http://avogadro.cc/
Version: 1.2.0-3
Section: universe/libs