It appears the kernel has stopped reporting any sound devices:
!!Loaded ALSA modules
!!-------------------
!!Sound Servers on this system
!!----------------------------
Pulseaudio:
Installed - Yes (/usr/bin/pulseaudio)
Running - Yes
!!Soundcards recognised by ALSA
!!-----------------------------
--- no soundcards ---
** Package changed: alsa-driver (Ubuntu) => linux (Ubuntu)
** Tags added: regression-update
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https://bugs.launchpad.net/bugs/1823261
Title:
PCI/internal sound card not detected
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