Install libgetfem5++ by entering the following commands in the terminal:
sudo apt update sudo apt install libgetfem5++
Description:
GETFEM++ generic finite element library
GETFEM++ is a library allowing the computation of any elementary matrix (even for mixed finite element methods) on the largest class of methods and elements, and for arbitrary dimension.
Homepage: http://home.gna.org/getfem/
Version: 5.2+dfsg1-6
Section: universe/libs