Debian 10 buster how to install nvidia laptop driver?

Question

linux

help install nvidia drivers on lenovo ideapad 100-15ibd
lspci output

00:02.0 VGA compatible controller: Intel Corporation HD Graphics 5500 (rev 09)
04:00.0 3D controller: NVIDIA Corporation GM108M [GeForce 920MX] (rev a2)

installed
sudo dpkg --add-architecture i386 && sudo apt-get update && sudo apt-get install bumblebee-nvidia primus primus-libs:i386
user optirun glxgears added
to bumblebee group - gives error

[  672.672864] [ERROR]Cannot access secondary GPU - error: Could not load GPU driver
[  672.672922] [ERROR]Aborting because fallback start is disabled.

/etc/bumblebee/bumblebee.conf
"KernelDriver=nvidia" to "KernelDriver=nvidia-current"
--- doesn't help