package trafshow (not installed) failed to install/upgrade: trying to overwrite '/usr/share/man/man1/trafshow.1.gz', which is also in package netdiag 1.0-17

[Jokermt]

Hello enthusiastic team Ubuntu developers team. My name is Mutalip I'm from Kyrgyzstan I've installed a "trafshow" util. But the installation had finished with several errors. After using a trafshow command by system has been generating an error report message box while working using ubuntu for several times. What is the problem I also can be help for you cause I'm a programmer also.|
Me Ubuntu Release 11.04 LTS. Thank you for giving such good service.

ProblemType: Package
DistroRelease: Ubuntu 12.04
Package: trafshow (not installed)
ProcVersionSignature: Ubuntu 3.2.0-49.75-generic-pae 3.2.46
Uname: Linux 3.2.0-49-generic-pae i686
NonfreeKernelModules: wl
ApportVersion: 2.0.1-0ubuntu17.3
AptOrdering:
 trafshow: Install
 trafshow: Configure
Architecture: i386
Date: Mon Jul 15 01:15:56 2013
DpkgTerminalLog:
 Unpacking trafshow (from .../trafshow_5.2.3-0ubuntu2_i386.deb) ...
 dpkg: error processing /var/cache/apt/archives/trafshow_5.2.3-0ubuntu2_i386.deb (--unpack):
  trying to overwrite '/usr/share/man/man1/trafshow.1.gz', which is also in package netdiag 1.0-17
DuplicateSignature: package:trafshow:(not installed):trying to overwrite '/usr/share/man/man1/trafshow.1.gz', which is also in package netdiag 1.0-17
ErrorMessage: trying to overwrite '/usr/share/man/man1/trafshow.1.gz', which is also in package netdiag 1.0-17
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100429)
MarkForUpload: True
SourcePackage: trafshow
Title: package trafshow (not installed) failed to install/upgrade: trying to overwrite '/usr/share/man/man1/trafshow.1.gz', which is also in package netdiag 1.0-17
UpgradeStatus: Upgraded to precise on 2013-06-02 (44 days ago)