Setting up libcheese8:amd64 (3.28.0-1ubuntu1) ...
Setting up libcheese-gtk25:amd64 (3.28.0-1ubuntu1) ...
Setting up grub-efi-amd64-signed (1.93.11+2.02-2ubuntu8.10) ...
Installing for x86_64-efi platform.
grub-install: error: efibootmgr failed to register the boot entry: Unknown error -1.
dpkg: error processing package grub-efi-amd64-signed (--configure):
installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 1
Processing triggers for libc-bin (2.27-3ubuntu1) ...
Setting up cheese (3.28.0-1ubuntu1) ...
Processing triggers for man-db (2.8.3-2ubuntu0.1) ...
Processing triggers for gnome-menus (3.13.3-11ubuntu1.1) ...
Processing triggers for hicolor-icon-theme (0.17-2) ...
dpkg: dependency problems prevent configuration of shim-signed:
shim-signed depends on grub-efi-amd64-signed; however:
Package grub-efi-amd64-signed is not configured yet.

dpkg: error processing package shim-signed (--configure):
dependency problems - leaving unconfigured