Upgrade from 18.04 to 20.04 and lost all sound

[MR ZenWiz]

I just finished upgrading Xubuntu 18.04 to 20.04 and all system sound
is gone.  According to pavucontrol, I only have Dummy Output and HDMI
(which is not connected and reports as unplugged).

My speakers are not detected, nor is the built in sound - speakers and
microphone.

I also keep getting a "System problem is reported" and I send the
problem report, but I have no idea what it is.

Where do I look first?

I cannot do without sound on this laptop (HP 8740w).  It was working
perfectly before the upgrade.

Thanks, I hope.

Mark