netdiag fails to install: file /usr/share/man/man1/trafshow.1.gz already exists in package trafshow

[jbatista]

Binary package hint: netdiag

When attempting to install netdiag, dpkg fails to install it, complaining that the file already exists in package trafshow.
Relevant output:

dpkg: error processing /var/cache/apt/archives/netdiag_1.0-13_amd64.deb (--unpack):
 trying to overwrite '/usr/share/man/man1/trafshow.1.gz', which is also in package trafshow 0:5.2.3-0ubuntu2

Further details:

1) Output of 'lsb_release -rd':
Description: Ubuntu 10.04.1 LTS
Release: 10.04

2) Output of 'apt-cache policy netdiag trafshow':
netdiag:
  Installed: (none)
  Candidate: 1.0-13
  Version table:
     1.0-13 0
        500 http://pt.archive.ubuntu.com/ubuntu/ lucid/universe Packages
trafshow:
  Installed: 5.2.3-0ubuntu2
  Candidate: 5.2.3-0ubuntu2
  Version table:
 *** 5.2.3-0ubuntu2 0
        500 http://pt.archive.ubuntu.com/ubuntu/ lucid/universe Packages
        100 /var/lib/dpkg/status

3) Expected outcome: Installation of netdiag without errors, either when trafshow is installed or not.

4) Observed outcome: netdiag cannot be installed if trafshow is already present. Both packages cannot coexist due to filename collision.

ProblemType: Package
DistroRelease: Ubuntu 10.04
Package: netdiag (not installed)
ProcVersionSignature: Ubuntu 2.6.32-27.49-generic 2.6.32.26+drm33.12
Uname: Linux 2.6.32-27-generic x86_64
NonfreeKernelModules: nvidia
Architecture: amd64
Date: Sat Jan 8 00:10:12 2011
ErrorMessage: a tentar reescrever '/usr/share/man/man1/trafshow.1.gz', que também existe no pacote trafshow 0:5.2.3-0ubuntu2
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release amd64 (20100429)
SourcePackage: netdiag
Title: package netdiag (not installed) failed to install/upgrade: a tentar reescrever '/usr/share/man/man1/trafshow.1.gz', que também existe no pacote trafshow 0:5.2.3-0ubuntu2