Black screen after booting

[Aravisian]

@4xa

So can I make the 5.15.0-100 kernel the default one, or do I have to keep selecting it in grub menu every time I boot up?

You can set the older kernel as default boot:

[HOW TO] set an older kernel to default boot

You may need to use an earlier kernel than the current kernel used by Zorin. This method allows you to set the kernel that you will boot into by default. To set the new kernel to default: Boot into the kernel you wish to be Saved. Open terminal and run: sudo nano /etc/default/grub Change GRUB_DEFAULT=0 to GRUB_DEFAULT=saved Hit enter to drop down a line. Add GRUB_SAVEDEFAULT=true ctrl+x to exit, then the y key to say yes to save, then the enter key to save as current configuration. Ru…

Or remove the newer kernel.

@4xa

Also my screen resolution is 1440x900, but the closest thing I found to it in the settings was 1400x900
Is there any way to change it to 1440x900 or do I have to work with it like this?

You can try using xrandr with -newmode and -addmode to create and add the preferred resolution:

Screen resolution 1440x900 not listed