How do I install gst-launch using apt-get or otherwise in the N9? I researched a bit and found it should be in a package named gstreamer0.10-tools. However, it does not seem to exist:

~ # apt-get install gstreamer0.10-tools
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package gstreamer0.10-tools is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
E: Package gstreamer0.10-tools has no installation candidate