I can also confirm this bug for Kubuntu 18.04 LTS at an older Apple iMac
8,1 computer. The solution seems to purge shim and then reinstall grub.

It would be really great if the corresponding devs can fix this issue by
add a simple check (for an Apple EFI environment) before shim is
installed. Or it may be also possible to make shim aware that there also
exists non Secure Boot capable UEFI systems. (So far I know, Apple
introduced the Secure Boot feature not before 2017.) On such nun Secure
Boot compliant systems shim only has to be inactive and quiet. ;-)

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https://bugs.launchpad.net/bugs/1867092

Title:
  Failed to set MokListRT: Invalid Parameter

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