package ppp 2.4.5-5.1ubuntu2.2 failed to install/upgrade: il sottoprocesso nuovo script pre-installation ha restituito lo stato di errore 1

while wxecuting do-release-upgrade I lost the connection so I could try to recover only later...

ProblemType: Package
DistroRelease: Ubuntu 15.04
Package: ppp 2.4.5-5.1ubuntu2.2
ProcVersionSignature: Ubuntu 3.19.0-31.36~14.04.1-generic 3.19.8-ckt7
Uname: Linux 3.19.0-31-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.16
Architecture: amd64
Date: Fri Oct 9 22:44:55 2015
DuplicateSignature: package:ppp:2.4.5-5.1ubuntu2.2:il sottoprocesso nuovo script pre-installation ha restituito lo stato di errore 1
ErrorMessage: il sottoprocesso nuovo script pre-installation ha restituito lo stato di errore 1
InstallationDate: Installed on 2015-09-18 (21 days ago)
InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
RelatedPackageVersions:
 dpkg 1.17.25ubuntu1
 apt 1.0.1ubuntu2.10
SourcePackage: ppp
Title: package ppp 2.4.5-5.1ubuntu2.2 failed to install/upgrade: il sottoprocesso nuovo script pre-installation ha restituito lo stato di errore 1
UpgradeStatus: Upgraded to vivid on 2015-10-09 (0 days ago)