I'm having this issue on my Dell Latitude E6410 on which Ubuntu 14.04
was working fine until I upgraded to 18.04.
$ cat /proc/asound/cards
0 [MID ]: HDA-Intel - HDA Intel MID
HDA Intel MID at 0xf6950000 irq 26
$ aplay -l
aplay: device_list:270: no soundcards found...
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https://bugs.launchpad.net/bugs/1781294
Title:
No sound card detected by PulseAudio and ALSA, but is visible in lspci
[Dell XPS 13 9360]
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