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I am using kubuntu LTS 18.04.
This morning I was promped to update the kernel to the 4.15.0-99-generic. 

After the upgrade I did not manage to get any sound. I checked
everything, pavucontrol, alsamix, everything was in order, the streams
showed as if they were playing, however I couldn't get any sound from
the speakers headphones and I could not get any sound recorded either.

I then rebooted with the previous version of the Kernel, and have my
sound back without doing anything at all.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

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 upgrading to 4.15.0-99-generic breaks the sound
https://bugs.launchpad.net/bugs/1875916
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