NVIDIA 390 driver

[Forpli]

Which command do ypu mean? You have installed kernel 5.15? Okay.

Is usually your grub menu shown at boot or not? If not, change the /etc/default/grub file with this link so that grub menu is shown when you boot:

Nvidia 390 drivers on kernel 6.8

@Aravisian already wrote You the Command to install the Kernel directly over the Terminal or add the Mainline Tool to do it graphical. To add something to @Aravisian's Command: Instead of the 72 use 141. So it should look like this: sudo apt install linux-headers-5.15.0-141-generic linux-image-5.15.0-141-generic linux-modules-5.15.0-141-generic linux-modules-extra-5.15.0-141-generic After you have installed the Packages, make a Reboot and in the GRUB Menu choose the Menu Point ''Advanced Optio…

Then reboot and in grub menu choose "Advanced options for Zorin" then select kernel 5.15 there. So you can see if kernel 5.15 is installed. Then it boots with this kernel.
After login follow the steps in the link "How to set an older kernel as default". Edit etc/default/grub with sudo rights.

Delete all old nvidia packages with:

sudo apt remove --purge '^nvidia-.*'

Then install the nvidia 390 drivers with:

sudo apt install nvidia-driver-390 nvidia-dkms-390

Now reboot.