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In Rhythmbox 3.4.4 - which is included with Ubuntu 20.04 LTS ("Focal Fossa") - there is the option to "rip" music in MPEG-4 Audio (".m4a") format... Underneath said option, there is a big ol' button that says:

Install additional software required to use this format

But clicking this button doesn't do anything, at all.

I did choose to install Ubuntu Restricted Extras when I did my "clean" install of Ubuntu 20.04 LTS ("Focal Fossa"), but just in case something went wrong, I re-installed it via Terminal.

Someone also suggested that I check that gstreamer1.0-libav and libgstreamer-plugins-good1.0-0 are installed - they both were.

After checking that the above were installed, I restarted my computer and removed / re-installed Rhythmbox - No change (i.e. Rhythmbox still has the same message under MPEG-4 Audio).

This issue affects both my laptop and my tablet.

Any ideas why this is?

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I'm not sure which specific package was missing, but this fixed it...

sudo apt-get install libgstreamer1.0-0 gstreamer1.0-plugins-base gstreamer1.0-plugins-good gstreamer1.0-plugins-bad gstreamer1.0-plugins-ugly gstreamer1.0-libav gstreamer1.0-doc gstreamer1.0-tools gstreamer1.0-x gstreamer1.0-alsa gstreamer1.0-gl gstreamer1.0-gtk3 gstreamer1.0-qt5 gstreamer1.0-pulseaudio

Obviously do this with Rhythmbox and any other media players you have installed closed... Once the installation is complete, you can open them again and the issue should be fixed.

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Combining Gregory Opera's answer and info from the answer over here, this got me working

sudo apt-get install gstreamer1.0-libav
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I added gstreamer1.0-plugins-bad to get the "big ol' button" to go away. Although I did have these from Gregory Opera's list already installed ... libgstreamer1.0-0 gstreamer1.0-plugins-base gstreamer1.0-plugins-good gstreamer1.0-plugins-ugly gstreamer1.0-libav gstreamer1.0-tools gstreamer1.0-x gstreamer1.0-alsa gstreamer1.0-gl gstreamer1.0-gtk3 gstreamer1.0-qt5 gstreamer1.0-pulseaudio.

Note that installing gstreamer1.0-plugins-bad also installed a load of other libraries.

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