Once the nVidia installer has decided there is no 'preconfigured' module available, it will handle compiling and installing a custom one for you, just say yes continue and compile one for me.
However, you will need to the kernel source installed on your machine for it to work. That means you need to install the kernel source that matches your running kernel exactly, and have that source 'configured' to match the kernel you are using. This is easy if you haven't changed your kernel since the distro install, just find the kernel-source package and install it, it should be configured as is.
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