The messages here are mostly in German, but I'll try to translate mist of it:

**dpkg:** Error when editing the package linux-image-6.9.7+bpo-amd64 (--configure): <<Installed posts installation script of the package linux-headers-6.9.7+bpo-amd64<<-subprocess returned error code 1 **dpgk:** dependency error hinders configuration of <that Linux header package>: linux-headers-6.9.7+bpo-amd64 depends on linux-image-6.9.7+bpo-amd64 (= 6.9.7-1~bpo12+1) | linux-image-6.9.7+bpo-amd64 -unsigned (= 6.9.7-1~bpo12+1); but: Package linux-image-6.9.7+bpo-amd64 is not configured yet. Package linux-image-6.9.7+bpo-amd64-unsigned is not installed. **dpgk:** Error while editing the Package linux-headers-6.9.7+bpo-amd64 (--configure): Dependency problem - remains unconfigured **dpkg:** Dependency problem hinder configuration of linux-headers-amd64: linux-headers-amd64 depends on linux-headers-6.9.7+bpo-amd64 (= 6.9.7-1~bpo12+1); but: Package linux-headers-6.9.7+bpo-amd64is not configured yet. **dpkg:** Errow while editing package linux-headers-amd64 (--configure): Dependency problem - remains in configured Errors occurred while editing these: linux-image-6.9.7+bpo-amd64 linux-headers-6.9.7+bpo-amd64 linux-headers-amd64

I really hope someone can help me out here..

EDIT: I kinda forgot to actually mention my problem. When booting nornall, I get stuck at a lonely white blinking cursor on a black screen, so startx seems to make some problems. I enter a TTY and run startx and this is what I get when running startx:

SOLUTION

• Uninstall your current nvidia driver (for example using sudo apt remove nvidia-driver on Debian)
• Install the headers for your kernel. your kernel you can check rather easily by running neofetch
• Install the headers required for your kernel. Do that by listing all packages with your kernel name in it. For example like this: apt list *6.9.7+bpo*
• reboot, install your nvidia driver again and rovoot again. Should be done.