Lately video clips wont play in browser: both Chromium & Firefox.
The Ubuntu version is 18.04.5 LTS, running on a virtual machine over Windows 10 host.

The video clip is played in the small preview window of the browser (for example in YouTube after search) when the mouse hoovers over the small window, but when this video is selected and clicked, it is opened, yet it is freezing and not play.

I tried some guidance from Firefox (remove HW acceleration), but I guess the problem is somehow with the OS, because Chromium stopped playing videos as well.

Another parallel problem which I am not sure if it is related, is with the upgrade (I opened another thread) - the Ubuntu 18 keeps being updated but when I try upgrading to Ubuntu 20.04 - it starts and crash. Also with command line.
I see no direct connection between these two issues, yet they may be related.

Additional info since I posted the question: the later part about Ubuntu upgrade was solved, simply after Oracle released a new VM version. I would assume they had a bug that is now fixed.
Still, now with the new installed Ubuntu 20.04 the original bug still exists: browsers will not play Videos. Since both Firefix and Chrome have same issue, I would assume the problem is somehow still related to the VM machine or to the Ubuntu OS. I am still investigating it.