dssp 4.0.4-1 (amd64 binary) in ubuntu lunar

 DSSP is an application you use to assign the secondary structure of a protein
 based on its solved three dimensional (3D) structure.
 .
 This version (4.0) of DSSP is a rewrite that writes annotated mmCIF files
 by default but can still produce the older dssp format. New is also the
 support of PP helices.