Install libelpa4 by entering the following commands in the terminal:
sudo apt update sudo apt install libelpa4
Description:
Eigenvalue SoLvers for Petaflop-Applications
ELPA is Eigenvalue SoLvers for Petaflop-Applications.
Homepage: http://elpa.mpcdf.mpg.de/
Version: 2016.05.001-4.2
Section: universe/libs