Could MSI Fast Boot skip scanning devices which the EFI subsystem in the ESP's copy of grub rely on?
There are also actually two "ubuntu" entries in firmware, one with extra firmware-specific extra options appended. One may work with fastboot while the other does not. If you re-enable Fastboot and hit F12, does one of the two 'ubuntu' entries you should see there work normally? ** Changed in: shim-signed (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1761336 Title: Drops to grub> prompt in Secure Boot Mode To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/shim-signed/+bug/1761336/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs