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Thank you, @AaronR16; by installing "grub-efi-arm64," I solved my problem with 23.04 -> 23.10 and finally got 24.04 working.
I just hooked the second 5K to my MBP M1 max. FYI, they work if set up as 4k monitors in Ubuntu, but this is far from optimal. The Parallel tools...
Confirmed M1/ARM, Same issue with Ubuntu 20.04 LTS ... kernels 5.4.0-90 and 5.4.0-100 are OK, but 5.4.0-104 breaks with EFI_RNG_PROTOCOL Both on...