Mint 18.2 Sonya Operational

     Our shell server has been upgraded to Sonya 18.2.  Initially I had some problems getting postfix working, chased it down to sendmail already being installed and not automatically deinstalled when postfix was installed, as it normally is on other debian derivatives.

     Also had issues with idmapd not working initially, this turned out to be an old issue with nsswitch.conf, compat does not work as advertised, it is necessary instead to specify nis files, which gives the behavior compat is supposed to but does not.