Check if you have the linux-modules-extra-6.8.0-31-generic package installed, or the one for your kernel version.
sudo apt install linux-modules-extra-$(uname -r)-generic
That's there the cifs.ko module is.
Check if you have the linux-modules- extra-6. 8.0-31- generic package installed, or the one for your kernel version.
sudo apt install linux-modules- extra-$ (uname -r)-generic
That's there the cifs.ko module is.