For certain input data (when default coregistration fails) FreeSurfer calls a tool that requires an older version of Ubuntu. https://mail.nmr.mgh.harvard.edu/pipermail//freesurfer/2014-May/038342.html https://www.mail-archive.com/freesurfer@nmr.mgh.harvard.edu/msg50592.html
For certain input data (when default coregistration fails) FreeSurfer calls a tool that requires an older version of Ubuntu.
https://mail.nmr.mgh.harvard.edu/pipermail//freesurfer/2014-May/038342.html
https://www.mail-archive.com/freesurfer@nmr.mgh.harvard.edu/msg50592.html