Jim
Plesase send the output of the following commands
which mpirun
ldd $NWCHEM_TOP/bin/$NWCHEM_TARGET/nwchem
mpif90 -show
PS We do have precompiled packages for Ubuntu 18.04
https://github.com/nwchemgit/nwchem/releases/download/6.8.1-release/nwchem_6.8.1+133+gitge...
https://github.com/nwchemgit/nwchem/releases/download/6.8.1-release/nwchem-data_6.8.1+133+...
Instructions for installing them:
curl -O https://github.com/nwchemgit/nwchem/releases/download/6.8.1-release/nwchem-data_6.8.1+133+gitge032219-2_all.ubuntu_bionic.deb
curl -O https://github.com/nwchemgit/nwchem/releases/download/6.8.1-release/nwchem-data_6.8.1+133+gitge032219-2_all.ubuntu_bionic.deb
sudo apt get libscalapack-mpi-dev libopenblas-dev
sudo dpkg -i nwchem-*6.8.1*deb
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