package clamav-daemon (not installed) failed to install/upgrade: subprocess installed post-installation script returned error exit status 2

Failure in clamd upgrade/install

ProblemType: Package
DistroRelease: Ubuntu 15.04
Package: clamav-daemon (not installed)
ProcVersionSignature: Error: [Errno 2] No such file or directory: '/proc/version_signature'
Uname: Linux 4.0.0-rc6-custom i686
ApportVersion: 2.17-0ubuntu1
AptOrdering:
 clamav-daemon: Install
 clamdscan: Install
 clamav-daemon: Configure
 clamdscan: Configure
 NULL: (null)
Architecture: i386
Date: Tue Mar 31 20:30:40 2015
DuplicateSignature: package:clamav-daemon:(not installed):subprocess installed post-installation script returned error exit status 2
ErrorMessage: subprocess installed post-installation script returned error exit status 2
InstallationDate: Installed on 2011-11-11 (1236 days ago)
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release i386 (20111012)
ProcCmdline: BOOT_IMAGE=/boot/vmlinuz-4.0.0-rc6-custom root=UUID=239a7bf6-c6d6-468d-90fb-5705e76c8def ro quiet splash crashkernel=384M-:128M vt.handoff=7
RelatedPackageVersions:
 dpkg 1.17.24ubuntu1
 apt 1.0.9.7ubuntu3
SourcePackage: clamav
Title: package clamav-daemon (not installed) failed to install/upgrade: subprocess installed post-installation script returned error exit status 2
UpgradeStatus: Upgraded to vivid on 2015-03-31 (0 days ago)