I've been using Ubuntu 20.04 for about 4 months now and have launched cheese a few times without any issue.
priyanshu@Inspiron-7501:~$ cheese
(cheese:499251): Cogl-WARNING **: 17:34:35.299: winsys/cogl-winsys-egl-kms.c:771: Error restoring saved CRTC
Segmentation fault (core dumped)
This error message keeps showing when I try to open it now. The other articles relating to errors in cheese have a different error message and I have not come accross a similar problem in recent Ubuntu system.