I tried to install Ubuntu 18.10 on my XPS 15 9570 earlier. Everything was working fine until I got to the partition selection part of the installation. That's when the installer crashed and I had to shut down my machine. I think it's because I had my SATA configuration set to RAID ON instead of AHCI, which is now fixed.

Now when I try to run the installer from my bootable USB I get the following error

Failed to open EFIBOOTmmx64.efi - Not Found

Failed to load image EFIBOOTmmx64.efi: Not Found

Failed to start MokManager: Not Fond

Something has gone seriously wrong: import_mok_state() failed

Hoping someone might have some idea as to what is going on