I had the exact same issue on 17.10 + XPS 13 + Dell firmware update. I booted in the BIOS setup and manually pointed the EFI to ubuntu's grub's EFI file. That i

I had the exact same issue on 17.10 + XPS 13 + Dell firmware update. I booted in the BIOS setup and manually pointed the EFI to ubuntu's grub's EFI file. That immediately fixed the problem.