Rhythmbox wants software that the Software center doesn't have

[tane]

In Rythmbox, if you go into Preferences/Music and then the Library structure heading you can set your preferred format to Mpeg Layer 3 audio (mp3). This or the Mpeg Layer 3 setting cause an information popup.

"Install additional software required to use this format"

Click on this open the software center but then gives an unable to find software response.

Installing gstreamer1.0-plugins-bad makes this go away.

sudo apt install gstreamer1.0-plugins-bad

It is possible you need gstreamer1.0-plugins-ugly as well but since I had already installed them I cannot tell.

This appears to be the bug: Bug #888847 “rhythmbox can't find ID3 tag muxer for MP3 support” : Bugs : gnome-codec-install package : Ubuntu

[StarTreker]

I use SMPlayer for everything.

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[Ponce-De-Leon]

Welcome to the Forum!

Only for the Future if You should need Codecs:

When You open the Software Store, scroll down to the End, You will see there a Button called ''Codecs''. When You click on it, You get an Overview with installable Codec Packages.

Then You can install more Codec Support over the Terminal with:

sudo apt install ubuntu-restricted-extras ffmpeg vlc

vlc is a Media Player which brings Codec Support with it. ffmpeg is no Player but brings Codec Support, too. ubuntu-restricted-extras is a Packages Bundel which brings Codec Support and Microsoft Fonts. That is the Reason why You will get a Licence Agreement Prompt where You have to navigatewith the Tab Key to ''Ok'' and press Enter to accept.