i was executing sudo apt-get update; sudo apt-get upgrade

[linuxar]

trying again sudo apt-get upgrade resulted in:

Errors were encountered while processing:
 /var/cache/apt/archives/gstreamer0.10-plugins-bad_0.10.21-1ubuntu10_amd64.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)

ProblemType: Package
DistroRelease: Ubuntu 11.04
Package: gstreamer0.10-plugins-bad 0.10.21-1ubuntu8
ProcVersionSignature: Ubuntu 2.6.38-7.39-generic 2.6.38
Uname: Linux 2.6.38-7-generic x86_64
Architecture: amd64
Date: Tue Apr 5 15:01:20 2011
ErrorMessage: trying to overwrite '/usr/share/locale/ja/LC_MESSAGES/.mo', which is also in package gstreamer0.10-plugins-ugly 0.10.17-1ubuntu1
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Alpha amd64 (20110324)
SourcePackage: gst-plugins-bad0.10
Title: package gstreamer0.10-plugins-bad 0.10.21-1ubuntu8 failed to install/upgrade: trying to overwrite '/usr/share/locale/ja/LC_MESSAGES/.mo', which is also in package gstreamer0.10-plugins-ugly 0.10.17-1ubuntu1
UpgradeStatus: No upgrade log present (probably fresh install)