Sound not working after upgrade to Xubuntu 21.10

[Steve Fowell]

I installed Xubuntu 21.04 (as the only operating system) on my Acer Chromebook CB3-111. Everything was working fine, including the sound. I upgraded to Xubuntu 21.10 as advised and now there is no sound. The Sound application shows that there are no hardware devices so the sound hardware must not have been detected.
To be sure, I reinstalled version 21.04 from scratch and upgraded to 21.10 again and I have the same problem. I had previously installed version 21.10 from scratch and had the same problem so I reverted to 21.04. But I now upgraded to 21.10 as I was directed to do so.
I have today (22/02/22) installed the latest updates for 21.10 but the problem remains.
Something in version 21.10 must have broken what was in version 21.04.
Please investigate.
Thanks
Steve

[Erich Eickmeyer (eeickmeyer)]

Thank you for taking the time to report this issue and helping to make Ubuntu better. Examining the information you have given us, this does not appear to be a bug report so we are closing it and converting it to a question in the support tracker. We understand the difficulties you are facing, but it is better to raise problems you are having in the support tracker at https://answers.launchpad.net/ubuntu if you are uncertain if they are bugs. You can also find help with your problem in the support forum of your local Ubuntu community http://loco.ubuntu.com/ or asking at https://askubuntu.com or https://ubuntuforums.org. For help on reporting bugs, see https://help.ubuntu.com/community/ReportingBugs.