package memtest86+ 5.01-3ubuntu2 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1. Installation was made in process update of diskless station from 15.10 to 16.04

[Helgy]

Run command "apt-get install memtest86+ xubuntu-core postfix". Run as root.
Receive error:
/usr/sbin/grub-probe: error: failed to get canonical path of `195.70.213.92:/usr/netboot/linux/xubuntu'.

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: memtest86+ 5.01-3ubuntu2
ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
Uname: Linux 4.4.0-21-generic i686
ApportVersion: 2.20.1-0ubuntu2
Architecture: i386
Date: Tue Apr 26 18:29:40 2016
DuplicateSignature:
 Setting up memtest86+ (5.01-3ubuntu2) ...
 /usr/sbin/grub-probe: error: failed to get canonical path of `195.70.213.92:/usr/netboot/linux/xubuntu'.
 dpkg: error processing package memtest86+ (--configure):
  subprocess installed post-installation script returned error exit status 1
ErrorMessage: subprocess installed post-installation script returned error exit status 1
RelatedPackageVersions:
 dpkg 1.18.4ubuntu1
 apt 1.2.10ubuntu1
SourcePackage: grub2
Title: package memtest86+ 5.01-3ubuntu2 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
UpgradeStatus: No upgrade log present (probably fresh install)

[Mate Kukri (mkukri)]

Hmm this seems related to GRUB trying to find something on a NFS (or other network mounted) disk.

However Ubuntu 16.04 is in ESM support only, please report a new bug if you are still experiencing similar issues on modern Ubuntu