package libphobos-4.9-dev (not installed) failed to install/upgrade: trying to overwrite '/usr/lib/x86_64-linux-gnu/libgphobos2.a', which is also in package libphobos-4.8-dev 4.8.3-12ubuntu3

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running apt-get update / apt-get upgrade packages are now broken.

ProblemType: Package
DistroRelease: Ubuntu 14.10
Package: libphobos-4.9-dev (not installed)
ProcVersionSignature: Ubuntu 3.16.0-28.38-generic 3.16.7-ckt1
Uname: Linux 3.16.0-28-generic x86_64
NonfreeKernelModules: sep3_15 pax nvidia
ApportVersion: 2.14.7-0ubuntu8
Architecture: amd64
Date: Wed Jan 14 09:54:02 2015
DuplicateSignature: package:libphobos-4.9-dev:(not installed):trying to overwrite '/usr/lib/x86_64-linux-gnu/libgphobos2.a', which is also in package libphobos-4.8-dev 4.8.3-12ubuntu3
ErrorMessage: trying to overwrite '/usr/lib/x86_64-linux-gnu/libgphobos2.a', which is also in package libphobos-4.8-dev 4.8.3-12ubuntu3
InstallationDate: Installed on 2014-11-11 (63 days ago)
InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
SourcePackage: gcc-4.9
Title: package libphobos-4.9-dev (not installed) failed to install/upgrade: trying to overwrite '/usr/lib/x86_64-linux-gnu/libgphobos2.a', which is also in package libphobos-4.8-dev 4.8.3-12ubuntu3
UpgradeStatus: No upgrade log present (probably fresh install)