package libavformat-extra-52 (not installed) failed to install/upgrade: trying to overwrite `/usr/lib/libavformat.so.52.31.0', which is also in package libavformat-unstripped-52

Karmic updates this am resulted in the following error:

E: /var/cache/apt/archives/libavformat-extra-52_4%3a0.5+svn20090706-1ubuntu1+extra1_i386.deb: trying to overwrite `/usr/lib/libavformat.so.52.31.0', which is also in package libavformat-unstripped-52

Actually more:

E: /var/cache/apt/archives/libavutil-extra-49_4%3a0.5+svn20090706-1ubuntu1+extra1_i386.deb: trying to overwrite `/usr/lib/libavutil.so.49.15.0', which is also in package libavutil-unstripped-49
E: /var/cache/apt/archives/libavcodec-extra-52_4%3a0.5+svn20090706-1ubuntu1+extra1_i386.deb: trying to overwrite `/usr/lib/libavcodec.so.52.20.0', which is also in package libavcodec-unstripped-52
E: /var/cache/apt/archives/libavformat-extra-52_4%3a0.5+svn20090706-1ubuntu1+extra1_i386.deb: trying to overwrite `/usr/lib/libavformat.so.52.31.0', which is also in package libavformat-unstripped-52
E: /var/cache/apt/archives/libpostproc-extra-51_4%3a0.5+svn20090706-1ubuntu1+extra1_i386.deb: trying to overwrite `/usr/lib/libpostproc.so.51.2.0', which is also in package libpostproc-unstripped-51
E: /var/cache/apt/archives/libswscale-extra-0_4%3a0.5+svn20090706-1ubuntu1+extra1_i386.deb: trying to overwrite `/usr/lib/libswscale.so.0.7.1', which is also in package libswscale-unstripped-0

ProblemType: Package
Architecture: i386
Date: Tue Aug 25 13:29:31 2009
DistroRelease: Ubuntu 9.10
ErrorMessage: trying to overwrite `/usr/lib/libavformat.so.52.31.0', which is also in package libavformat-unstripped-52
Package: libavformat-extra-52 (not installed)
ProcVersionSignature: Ubuntu 2.6.31-7.27-generic
SourcePackage: ffmpeg-extra
Title: package libavformat-extra-52 (not installed) failed to install/upgrade: trying to overwrite `/usr/lib/libavformat.so.52.31.0', which is also in package libavformat-unstripped-52
Uname: Linux 2.6.31-7-generic i686