If you "lost" kernel modules, then you will need to re-install the kernel package ... "force" it if you have to, unless there is a "refresh" option of some kind ... before you restart the machine.
Kernel modules are "part of" the kernel and therefore ought to be present in the "kernel" packages. If you have further questions, you should ask the supplier of your particular distro. (That isn't a brush-off: Distros do vary, sometimes considerably, in exactly how they handle these things...)
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