I'm guessing my problem is at least related if not exactly the same.
Here is the /var/log/apt/term.log relevant info:
Preparing to unpack .../08-firmware-sof-signed_1.7-1_all.deb ...
Unpacking firmware-sof-signed (1.7-1) ...
dpkg: error processing archive
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: firmware-sof (Ubuntu)
Status: New => Confirmed
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Linux 5.10.89 because https://bugs.launchpad.net/ubuntu/+source/alsa-
driver/+bug/1942385/comments/3
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Title:
package firmware-sof-signed (not