apt-get install gstreamer0.10-plugins-ivorbis

Reading package lists...
Building dependency tree...
The following NEW packages will be installed:
  gstreamer0.10-plugins-ivorbis
0 upgraded, 1 newly installed, 0 to remove and 28 not upgraded.
Need to get 0B/20.6kB of archives.
After unpacking 86.0kB of additional disk space will be used.
WARNING: The following packages cannot be authenticated!
  gstreamer0.10-plugins-ivorbis
Install these packages without verification [y/N]? y

(Reading database ... 19316 files and directories currently installed.)
Unpacking gstreamer0.10-plugins-ivorbis (from .../gstreamer0.10-plugins-ivorbis_1%3a0.1-1_armel.deb) ...

dpkg: error processing /var/cache/apt/archives/gstreamer0.10-plugins-ivorbis_1%3a0.1-1_armel.deb (--unpack):
 trying to overwrite `/usr/lib/gstreamer-0.10/libgstivorbis.so', which is also in package gstreamer0.10-plugins-bad
Errors were encountered while processing:
 /var/cache/apt/archives/gstreamer0.10-plugins-ivorbis_1%3a0.1-1_armel.deb
W: Couldn't stat source package list http://www.maemo.org.br mistral/main Packages (/var/lib/apt/lists/www.maemo.org.br_VoIP_apt_dists_mistral_main_binary-armel_Packages) - stat (2 No such file or directory)
W: Couldn't stat source package list http://www.maemo.org.br mistral/main Packages (/var/lib/apt/lists/www.maemo.org.br_VoIP_apt_dists_mistral_main_binary-armel_Packages) - stat (2 No such file or directory)
W: You may want to run apt-get update to correct these problems
E: Sub-process /usr/bin/dpkg returned an error code (1)