Hmm. Your screenshot shows the program says "Media: Audio CD-ROM", so it
obviously understands there's an audio CD in there. Other than saying
'unknown' instead of 'Audio CD' in the picture bar, is the functionality
of the program affected in any way?
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At one time, gnome-disks or gnome-disk-utility did detect audio CDs. I
just fired up Linux Mint 20.1 on a USB flash drive and whatever version
of gnome-disk-utility it has, it shows "Audio CD" instead of "unknown."
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Desktop
Note: Audio CD's don't have a filesystem and don't mount. I don't use
Gnome or Gnome Disks, so I can't tell you whether this is expected
behavior for an audio CD or the program should offer more info about the
disc.
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I grabbed a music CD (pink floyd, delicate sounds of thunder disc 2) and
inserted it into my hirsute system.
Response was identical to that described by OP, with my GNOME-DISKS
looking pretty much identical to the picture provided (excluding red
censorship, dvd drive model, size of disc etc or
