[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]

"Package operation Failed" pop up also displayed this time. 
No request for a restart this time. 
Noted the "Virtual Box failed." at top of error report. This seemed new to me.

Have Virturalbox 5.1.8 installed, downloading and installing 5.2 and
repeating update to see if there is a change in this error.

Well this is interesting. My attempt at getting Virturalbox 5.2
installed has lead to problems I need to resolve with Oracle concerning
apt-get install being unable to access their source at

deb http://download.virtualbox.org/virtualbox/debian xenial contrib
which contains new dependencies unavailable elsewhere.

I'm getting instead
Failed to fetch http://download.virtualbox.org/virtualbox/debian/dists/xenial/InRelease  Unable to find expected entry 'contrib/source/Sources' in Release file 

Or I am missunderstanding their instructions at
https://www.virtualbox.org/wiki/Linux_Downloads

I am pritty sure this is an Oracle problem unless any of you have another insight.
Wish I could be better help.

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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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