UPDATE: I've installed Kubuntu 19.10 on a separate drive in the same system and I've found that this bug still persists irregardless of options. It doesn't matter if I choose encryption or not, nor lvm or not. Out of curiosity, I booted a thumb drive with the latest live build on UEFI and escaping the splash screen and it complained about the missing drives while the live image was booting.
UPDATE: I've installed Kubuntu 19.10 on a separate drive in the same system and I've found that this bug still persists irregardless of options. It doesn't matter if I choose encryption or not, nor lvm or not. Out of curiosity, I booted a thumb drive with the latest live build on UEFI and escaping the splash screen and it complained about the missing drives while the live image was booting.