~ # apt-get install gstreamer-tools
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following extra packages will be installed:
  gstreamer0.10-tools
The following NEW packages will be installed
  gstreamer-tools gstreamer0.10-tools
0 upgraded, 2 newly installed, 0 to remove and 0 not upgraded.
Need to get 0B/1,263kB of archives.
After this operation, 1,540kB of additional disk space will be used.
Do you want to continue [Y/n]? y
WARNING: The following packages cannot be authenticated!
  gstreamer0.10-tools gstreamer-tools
Install these packages without verification [y/N]? y
Aegis rejecting /var/cache/apt/archives/gstreamer0.10-tools_0.10.34-0maemo2+0m6_armel.deb: package 'gstreamer0.10-tools' origin cannot be determined  -- signature check failed
Aegis rejecting /var/cache/apt/archives/gstreamer-tools_0.10.34-0maemo2+0m6_armel.deb: package 'gstreamer-tools' origin cannot be determined  -- signature check failed
aegis aborting dpkg -- all listed package files rejected
Compilation failed in require.
Updating desktop entries... Done
E: Sub-process /usr/bin/dpkg returned an error code (255)