package pure-ftpd 1.0.36-1.1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 137

just installed and trying to run for the 1st time

ProblemType: Package
DistroRelease: Ubuntu 14.04
Package: pure-ftpd 1.0.36-1.1
ProcVersionSignature: Ubuntu 3.13.0-85.129-generic 3.13.11-ckt36
Uname: Linux 3.13.0-85-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.14.4-0ubuntu1~ubuntu14.04.1~c42.ppa1
Architecture: amd64
Date: Sat Apr 30 23:34:07 2016
DuplicateSignature: package:pure-ftpd:1.0.36-1.1:subprocess installed post-installation script returned error exit status 137
ErrorMessage: subprocess installed post-installation script returned error exit status 137
InstallationDate: Installed on 2013-12-21 (861 days ago)
InstallationMedia: Ubuntu 12.04.3 LTS "Precise Pangolin" - Release amd64 (20130820.1)
SourcePackage: pure-ftpd
Title: package pure-ftpd 1.0.36-1.1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 137
UpgradeStatus: Upgraded to trusty on 2014-06-08 (692 days ago)