64 bit - Pre-installed GStreamer 0.10 does not recognized the installed element "ladspa-gate"

I am new to gstreamer, and wanted to set it up such that I can explore most plugins (good, bad, ugly, etc.).

I recently started using gstreamer 0.10 and intended to use it to process audio files.

I needed to use "ladspa-gate" which belongs to the GStreamer Bad Plugins 0.10.

Running gst-launch-0.10 --version to show what version of gstreamer is preinstalled shows gst-launch-0.10 version 0.10.36.

I also ran the following to install gstreamer-plugins-bad (not sure if I needed all of them but I just thought it wouldn't hurt to get them all)

sudo apt-get install gstreamer0.10-plugins-bad-multiverse gstreamer0.10-plugins-bad-multiverse-dbg gstreamer0.10-plugins-bad gstreamer0.10-plugins-bad-doc gstreamer0.10-plugins-bad-dbg

After the installation, I was expecting ladspa-gate to work because it belongs to gstreamer-plugins-bad (according to - http://www.freedesktop.org/software/gstreamer-sdk/data/docs/latest/gst-plugins-bad-plugins-0.10/gst-plugins-bad-plugins-plugin-ladspa.html), but when I tried running

gst-launch-0.10 filesrc location="audio.mp3" ! mad ! ladspa-gate Threshold=-30.0 ! alsasink

it resulted in

WARNING: erroneous pipeline: no element "ladspa-gate"

After that, I started to look for similar issues on the internet, and tried removing the old registry

rm -fv ~/.gstreamer-0.10/registry*

It still did not work.

Then I proceeded to run

gst-inspect-0.10 ladspa

which resulted in

Plugin Details:
  Name:                 ladspa
  Description:          All LADSPA plugins
  Filename:             /usr/lib/x86_64-linux-gnu/gstreamer-0.10/libgstladspa.so
  Version:              0.10.23
  License:              LGPL
  Source module:        gst-plugins-bad
  Source release date:  2012-02-20
  Binary package:       GStreamer Bad Plugins (Ubuntu)
  Origin URL:           https://launchpad.net/distros/ubuntu/+source/gst-plugins-bad0.10


  0 features:

and ll /usr/lib/x86_64-linux-gnu/gstreamer-0.10/libgstladspa.so did show that there is such file (-rw-r--r-- 1 root root 18920 Apr 15 14:07 /usr/lib/x86_64-linux-gnu/gstreamer-0.10/libgstladspa.so).

However, if I run gst-inspect-0.10 | grep ladspa it shows nothing, which I interpret it as ladspa plugins are not properly setup (maybe even the entire gst plugins bad), therefore is not registered as a ready-for-use plugin.

Another thing probably worth mentioning is that there are two directories under /usr/lib which contains gstreamer-0.10 related files, which are /usr/lib/gstreamer-0.10/ and /usr/lib/x86_64-linux-gnu/gstreamer-0.10/; I suspect that /usr/lib/gstreamer-0.10/ came from other gstreamer related packages I installed along the path of trying to solve the issue, because my other ubuntu machine does not have such directory, but does have the other directory.

Next thing I might try is doing a fresh install from source, but I hope I don't have to go there. I'd like to avoid unnecessary messing-around.