The bug is fixed when I updated mutter to 3.36.1-1ubuntu0.20.04.1.
BUT!!!!
After an "Automatic Screen Lock", the display turned off, the Gnome Shell crash and show us a blank screen with the message "Oh no! Something has gone wrong."
This bug did not appears before the update.
I have a NVIDIA card. I think that this problem occurs only with NVIDIA users.
I have other PC (without a NVIDIA card) and the problem not occurs.
The bug is fixed when I updated mutter to 3.36.1- 1ubuntu0. 20.04.1.
BUT!!!!
After an "Automatic Screen Lock", the display turned off, the Gnome Shell crash and show us a blank screen with the message "Oh no! Something has gone wrong."
This bug did not appears before the update.
I have a NVIDIA card. I think that this problem occurs only with NVIDIA users.
I have other PC (without a NVIDIA card) and the problem not occurs.