I encountered a bug with my GTX 1060 Nvidia video card. I installed Retrowave 3.8.50 with the Nvidia Free drivers. I ended up with an unstable E16 desktop, when I clicked on the cairio dock to display the folders, my system returned to the lightdm login page. Under E27, the system sent me a warning, saying that the gpu did not manage opengl. After several attempts I found it. After a reinstallation of the system, with the Nvidia priority drivers, everything returned to normal
I received an installation report with a missing to install package for that, maybe was you?
Try to install it:
api firmware-nvidia-graphics
maybe the firmware-nvidia-gsp too, but i think the first one is the one you need
Then reboot and see if works
If doesn't, then you must try to use the privative drivers instead
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