Provided by: sbsigntool_0.6-0ubuntu10.2_amd64 

NAME
sbattach - UEFI secure boot detached signature tool
SYNOPSIS
sbattach --attach <sigfile> <efi-boot-image>
sbattach --detach <sigfile> [--remove] <efi-boot-image>
sbattach --remove <efi-boot-image>
DESCRIPTION
Attach or detach a signature file to/from a boot image
OPTIONS
--attach <sigfile>
set <sigfile> as the boot image's signature table
--detach <sigfile>
copy the boot image's signature table to <sigfile>
--remove
remove the boot image's signature table from the original file
sbattach 0.6 May 2021 SBATTACH(1)