GRUB does detect /boot/vmlinuz-4.14.12-gnu. Let us see /etc/default/grub. In particular, is GRUB_DEFAULT 0?

You have many kernels installed. That is quite a waste of disk space. You can remove packages relating to older versions of the kernel (new versions of the kernel do not substitute older versions, unlike any other package) such as "linux-image-*", "linux-headers-*", ... with a version number that is not the largest (in the dictionary order: the leftmost dot-separated numbers are the most significant) or the second largest (for safety: if the latest kernel does not boot or is defective, you can boot the older one that raises no issue).

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