Last week I had an interesting problem with ubuntu 18.04. I updated the system using 'sudo apt-get update && sudo apt-get upgrade' and for my surprise when I restarted the computer I had no sound e no mic. The only output was Dummy Output. I tried everything tutorial.
So I decided to reinstall using USB boot. Ok... Everything was working fine until the update, AGAIN!
I reinstalled again!
This time, I decided to update using Software Update and it worked!! I don't know why but updating ubuntu 18.04.2 to 18.04.5 with sound and mic functioning properly, just using the Software Update. Is this problem only on Dell G3 3590 or is it a general problem?
(sorry my english, rs)