install driver ether RTL8111/8168/8411

[Ultegro778]

i have problem when install ethernet card driver. when i type

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sudo apt-get install r8168-dkms

it show

Errors were encountered while processing:
grub-pc
grub-efi-amd64-signed
grub-gfxpayload-lists
grub2
shim-signed
linux-image-4.15.0-24-generic
linux-image-4.15.0-23-generic
E: Sub-process /usr/bin/dpkg returned an error code (1)

im using kerner 4.15.0-20. thx

[JeremyB]

Post results for

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dpkg -l | grep ^..r