package libssl1.0.0 1.0.1-4ubuntu5.7 failed to install/upgrade: subprocess installed post-installation script returned error exit status 2

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ProblemType: Package
DistroRelease: Ubuntu 12.04
Package: libssl1.0.0 1.0.1-4ubuntu5.7
ProcVersionSignature: Ubuntu 3.2.0-38.61-generic 3.2.37
Uname: Linux 3.2.0-38-generic x86_64
NonfreeKernelModules: fglrx
ApportVersion: 2.0.1-0ubuntu17.1
Architecture: amd64
Date: Sat Mar 16 11:39:20 2013
DuplicateSignature:
 Setting up libssl1.0.0 (1.0.1-4ubuntu5.7) ...
 Can't locate Debconf/Db.pm in @INC (@INC contains: /opt/ActivePerl-5.16/site/lib /opt/ActivePerl-5.16/lib .) at /usr/share/debconf/frontend line 6.
 BEGIN failed--compilation aborted at /usr/share/debconf/frontend line 6.
 dpkg: error processing libssl1.0.0 (--configure):
  subprocess installed post-installation script returned error exit status 2
ErrorMessage: subprocess installed post-installation script returned error exit status 2
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
MarkForUpload: True
SourcePackage: openssl
Title: package libssl1.0.0 1.0.1-4ubuntu5.7 failed to install/upgrade: subprocess installed post-installation script returned error exit status 2
UpgradeStatus: Upgraded to precise on 2012-07-01 (258 days ago)