Problem Encountered:
$ ./quartus
quartus: error while loading shared libraries: libpng12.so.0: cannot open shared object file: No such file or directory
Resolution:
- Download libpng12 from https://packages.ubuntu.com/xenial/amd64/libpng12-0/download
- Run
$ sudo dpkg -i libpng12-0_1.2.54-1ubuntu1.1_amd64.deb