title: How to install libgfortran.so.4 on ubuntu 16.06
body: <p>An app I use just updated and it no longer runs on my system. When I try to run the application I get the error: <code>error while loading shared libraries: libgfortran.so.4: cannot open shared object file: No such file or directory</code></p>
  
  <p>I looked on my system and only libgfortran.so.3 is available. Do you know what should I do to have the next version also? Which package should I install? (my system is ubuntu 16.04)</p>