had the same error with Clear Linux:

Failed to open \EFI\org.clearlinux\mmx64.efi - Not Found
Failed to load image \EFI\org.clearlinux\mmx64.efi - Not Found

Failed to start MokManager: Not Found
Something has gone seriously wrong: import_mok_state() failed
: Not Found

doing this from #51:
# chattr -i /sys/firmware/efi/efivars/Mok*
# rm /sys/firmware/efi/efivars/Mok*

from Kali (multi boot) fixed it.

I multi boot win 10, macOS from clover, kali, Clear, openSUSE tumbleweed and 
Slackware on a test machine.  OpenSUSE recent update enabled secure boot and 
put the Mok* files there, I disabled secure boot, rewrote grub from there, 
double checked and deleted the Mok files from the last boot and that kept the 
problem from reoccurring.  
Thank you so much for clearing up this problem.

-Dan

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https://bugs.launchpad.net/bugs/1798171

Title:
  System fails to boot with \EFI\BOOT\mmx64.efi - Not Found

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