package gnat-4.9 4.9.1-1ubuntu2 failed to install/upgrade: trying to overwrite '/usr/share/doc/gnat-4.9-base/test-summary.gz', which is also in package gnat-4.9-base 4.9.0-1ubuntu5

Just doing upgrade

ProblemType: Package
DistroRelease: Ubuntu 14.10
Package: gnat-4.9 4.9.1-1ubuntu2
ProcVersionSignature: Ubuntu 3.16.0-6.11-generic 3.16.0-rc7
Uname: Linux 3.16.0-6-generic x86_64
ApportVersion: 2.14.5-0ubuntu3
Architecture: amd64
Date: Fri Aug 1 09:12:10 2014
DuplicateSignature: package:gnat-4.9:4.9.1-1ubuntu2:trying to overwrite '/usr/share/doc/gnat-4.9-base/test-summary.gz', which is also in package gnat-4.9-base 4.9.0-1ubuntu5
ErrorMessage: trying to overwrite '/usr/share/doc/gnat-4.9-base/test-summary.gz', which is also in package gnat-4.9-base 4.9.0-1ubuntu5
InstallationDate: Installed on 2014-02-24 (160 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
SourcePackage: gnat-4.9
Title: package gnat-4.9 4.9.1-1ubuntu2 failed to install/upgrade: trying to overwrite '/usr/share/doc/gnat-4.9-base/test-summary.gz', which is also in package gnat-4.9-base 4.9.0-1ubuntu5
UpgradeStatus: No upgrade log present (probably fresh install)