package clamav-milter 0.98.5+addedllvm-0ubuntu0.14.04.1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

ubuntu 14.04

i don't have more info
but this happens when the system
tries to update clam

ProblemType: Package
DistroRelease: Ubuntu 14.04
Package: clamav-milter 0.98.5+addedllvm-0ubuntu0.14.04.1
ProcVersionSignature: Ubuntu 3.13.0-43.72-generic 3.13.11.11
Uname: Linux 3.13.0-43-generic i686
ApportVersion: 2.14.1-0ubuntu3.6
Architecture: i386
Date: Sun Jan 11 13:49:28 2015
DpkgHistoryLog:
 Start-Date: 2015-01-11 13:49:08
 Commandline: aptdaemon role='role-commit-packages' sender=':1.31'
 Upgrade: linux-firmware:i386 (1.127.10, 1.127.11), libnss3:i386 (3.17.1-0ubuntu0.14.04.1, 3.17.1-0ubuntu0.14.04.2), libcgmanager0:i386 (0.24-0ubuntu7, 0.24-0ubuntu7.1), cpio:i386 (2.11+dfsg-1ubuntu1, 2.11+dfsg-1ubuntu1.1), mime-support:i386 (3.54ubuntu1, 3.54ubuntu1.1), libnss3-1d:i386 (3.17.1-0ubuntu0.14.04.1, 3.17.1-0ubuntu0.14.04.2), libnss3-nssdb:i386 (3.17.1-0ubuntu0.14.04.1, 3.17.1-0ubuntu0.14.04.2)
DuplicateSignature: package:clamav-milter:0.98.5+addedllvm-0ubuntu0.14.04.1:subprocess installed post-installation script returned error exit status 1
ErrorMessage: subprocess installed post-installation script returned error exit status 1
InstallationDate: Installed on 2014-05-09 (247 days ago)
InstallationMedia: Lubuntu 13.10 "Saucy Salamander" - Release i386 (20131016.1)
ProcCmdline: BOOT_IMAGE=/boot/vmlinuz-3.13.0-43-generic root=UUID=5743b102-fc13-4793-adb2-30f29232db1f ro quiet splash vt.handoff=7
SourcePackage: clamav
Title: package clamav-milter 0.98.5+addedllvm-0ubuntu0.14.04.1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
UpgradeStatus: Upgraded to trusty on 2014-05-09 (247 days ago)