[Bug 1685383] Re: package nfs-kernel-server 1:1.2.8-9ubuntu12.1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

[L. P. Luigi Espenlaub]

Could my just posted problem be complicated by Apt-get install looking for the wrong repository?
The new repository I added to the source list is:

deb http://download.virtualbox.org/virtualbox/debian xenial contrib

but Ubuntu is apparently still looking for:
http://download.virtualbox.org/virtualbox/debian/dists/xenial/InRelease 

[**this InRelease source is not in my "Other Software" repository list,
so where is Ubuntu getting it? **  I am really lost here.]

This is the same repository that Ubuntu Software center is looking for
for Virtualbox 5.0.

Perhaps it is because I keep getting this that apt-get install is
problematic:

sudo apt autoremove
Reading package lists... Done
Building dependency tree       
Reading state information... Done
0 upgraded, 0 newly installed, 0 to remove and 24 not upgraded.
1 not fully installed or removed.
After this operation, 0 B of additional disk space will be used.
Setting up nfs-kernel-server (1:1.2.8-9ubuntu12.1) ...

Job for nfs-server.service failed because the control process exited with error code. See "systemctl status nfs-server.service" and "journalctl -xe" for details.
invoke-rc.d: initscript nfs-kernel-server, action "restart" failed.                 <<-----**
● nfs-server.service - NFS server and services
   Loaded: loaded (/lib/systemd/system/nfs-server.service; enabled; vendor preset: enabled)

   Active: failed (Result: exit-code) since Sat 2017-10-28 04:06:00 EDT; 11ms ago      <<-----**
  Process: 3719 ExecStartPre=/usr/sbin/exportfs -r (code=exited, status=22)

Oct 28 04:06:00 LUIGIWRTRENVY14 systemd[1]: Starting NFS server and
services...

Oct 28 04:06:00 LUIGIWRTRENVY14 exportfs[3719]: exportfs: /etc/exports:1: syntax error: bad option list
Oct 28 04:06:00 LUIGIWRTRENVY14 systemd[1]: nfs-server.service: Control process exited, code=exited status=22                                                             <<-----**

Oct 28 04:06:00 LUIGIWRTRENVY14 systemd[1]: Failed to start NFS server and services.
Oct 28 04:06:00 LUIGIWRTRENVY14 systemd[1]: nfs-server.service: Unit entered failed state.
Oct 28 04:06:00 LUIGIWRTRENVY14 systemd[1]: nfs-server.service: Failed with result 'exit-code'.  <<**

Hint: Some lines were ellipsized, use -l to show in full.
dpkg: error processing package nfs-kernel-server (--configure):
 subprocess installed post-installation script returned error exit status 1
Errors were encountered while processing:
 nfs-kernel-server
E: Sub-process /usr/bin/dpkg returned an error code (1) 

Unfortunately I do not have the experience to interpret and troubleshoot this. 
Is this related?
Is this a seperate bug and should be reported elsewhere?

It is certainly screwing up any attempt at using apt-get commands.

 I have to resolve this before I can even attempt to install the new
Oracle key as far as I can see.

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https://bugs.launchpad.net/bugs/1685383

Title:
  package nfs-kernel-server 1:1.2.8-9ubuntu12.1 failed to
  install/upgrade: subprocess installed post-installation script
  returned error exit status 1

Status in nfs-utils package in Ubuntu:
  Confirmed

Bug description:
  virtualbox crashed

  ProblemType: Package
  DistroRelease: Ubuntu 16.04
  Package: nfs-kernel-server 1:1.2.8-9ubuntu12.1
  ProcVersionSignature: Ubuntu 4.4.0-72.93-generic 4.4.49
  Uname: Linux 4.4.0-72-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.5
  Architecture: amd64
  Date: Sat Apr 22 00:59:40 2017
  ErrorMessage: subprocess installed post-installation script returned error exit status 1
  InstallationDate: Installed on 2015-12-09 (499 days ago)
  InstallationMedia: Ubuntu-MATE 15.10 "Wily Werewolf" - Release amd64 (20151021)
  RelatedPackageVersions:
   dpkg 1.18.4ubuntu1.1
   apt  1.2.19
  SourcePackage: nfs-utils
  Title: package nfs-kernel-server 1:1.2.8-9ubuntu12.1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
  UpgradeStatus: Upgraded to xenial on 2016-05-18 (338 days ago)

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