I tried to install ubuntu but now my laptop won’t boot

I tried to install Ubuntu but after restarting my laptop at the end of the install, it wouldn’t boot and gave me the following error message.

Failed to open \EF\BOOT\mmx64.efi – Not Found Failed to load image \EF\BOOT\mmx64.efi: Not Found Failed to start MokManager: Not Found Something has gone seriously wrong: import_mok_state() failed: Not Found