Comment 7 for bug 1860345

What can I do now, while I wait for a bug fix (for issue #1)?

You can do something yourself to address issue #2...

REMEDY FOR ISSUE #2:
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Simply install the missing files. You can install files for kernel 5.3.0-18 (see A), which comes with 19.10, or you can install a newer kernel (see B).

(A) In Cubic's chroot, reinstall the packages with missing files:

$ sudo apt update
$ sudo apt install --reinstall linux-headers-5.3.0-18 linux-headers-5.3.0-18-generic linux-image-5.3.0-18-generic

...OR...

(B) Alternatively, you can install the latest available Linux kernel.

$ sudo apt update
$ sudo apt install linux-headers linux-headers-generic linux-image-generic

Either of these approaches will add the missing files to /boot and Cubic should be able to pick these up and display the corresponding kernel files (vmlinuz and initrd) on the Kernels tab.