Your efibootmgr config shows:

BootOrder: 0004,0001,0003,2001,2002,2003


Boot0004* KubuntuGrub
b666b1d46598,0xe1800,0x31800)/File(\EFI\ubuntu\grubx64.efi)A01 ..

So what set up this entry?  Ubuntu's shim and grub packages do not.  And
this entry is not bootable because you are bypassing shim and trying to
boot grub directly.

** Changed in: shim (Ubuntu)
       Status: New => Incomplete

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  Kubuntu 16.04 won't boot after last update if uefi secure boot is
  enabled (windows 10 starts directly, no possibility to access grub),
  without secure boot everything works normal

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