package libungif4g (not installed) failed to install/upgrade: trying to overwrite '/usr/lib/libungif.so.4', which is also in package libgif4 0:4.1.6-9

[fares fayah al-motayri]

i can't do update for os

ProblemType: Package
DistroRelease: Ubuntu 10.04
Package: libungif4g (not installed)
ProcVersionSignature: Ubuntu 2.6.32-25.44-generic 2.6.32.21+drm33.7
Uname: Linux 2.6.32-25-generic i686
Architecture: i386
Date: Mon Nov 8 13:13:51 2010
ErrorMessage: trying to overwrite '/usr/lib/libungif.so.4', which is also in package libgif4 0:4.1.6-9
InstallationMedia: Ubuntu 10.04.1 LTS "Lucid Lynx" - Release i386 (20100816.1)
SourcePackage: libungif4
Title: package libungif4g (not installed) failed to install/upgrade: trying to overwrite '/usr/lib/libungif.so.4', which is also in package libgif4 0:4.1.6-9