package python-protobuf 2.4.1-1ubuntu2 failed to install/upgrade: symbolic link '/usr/lib/python2.7/dist-packages/protobuf-2.4.1.egg-info/dependency_links.txt' size has changed from 71 to 45

[cesar]

i cant install upgrades packages

ProblemType: Package
DistroRelease: Ubuntu 13.04
Package: python-protobuf 2.4.1-1ubuntu2
ProcVersionSignature: Ubuntu 3.8.0-34.49-generic 3.8.13.12
Uname: Linux 3.8.0-34-generic x86_64
NonfreeKernelModules: fglrx
ApportVersion: 2.9.2-0ubuntu8.5
AptOrdering:
 python-protobuf: Install
 python-protobuf: Configure
Architecture: amd64
Date: Wed Nov 27 12:12:02 2013
DpkgTerminalLog:
 Preparing to replace python-protobuf 2.4.1-1ubuntu2 (using .../python-protobuf_2.4.1-3ubuntu1_amd64.deb) ...
 Unpacking replacement python-protobuf ...
 dpkg: error processing /var/cache/apt/archives/python-protobuf_2.4.1-3ubuntu1_amd64.deb (--unpack):
  symbolic link '/usr/lib/python2.7/dist-packages/protobuf-2.4.1.egg-info/dependency_links.txt' size has changed from 71 to 45
DuplicateSignature: package:python-protobuf:2.4.1-1ubuntu2:symbolic link '/usr/lib/python2.7/dist-packages/protobuf-2.4.1.egg-info/dependency_links.txt' size has changed from 71 to 45
ErrorMessage: symbolic link '/usr/lib/python2.7/dist-packages/protobuf-2.4.1.egg-info/dependency_links.txt' size has changed from 71 to 45
MarkForUpload: True
SourcePackage: protobuf
Title: package python-protobuf 2.4.1-1ubuntu2 failed to install/upgrade: symbolic link '/usr/lib/python2.7/dist-packages/protobuf-2.4.1.egg-info/dependency_links.txt' size has changed from 71 to 45
UpgradeStatus: Upgraded to raring on 2013-11-27 (0 days ago)