Your efibootmgr config shows:

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

and:

Boot0004* KubuntuGrub
PciRoot(0x0)/Pci(0x13,0x0)/Sata(0,0,0)/HD(2,GPT,4077d5c5-1e4f-4d76-baba-
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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https://bugs.launchpad.net/bugs/1625159

Title:
  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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