The error in your log is:
Setting up grub-efi-amd64-signed (1.142.8+2.04-1ubuntu26.6) ...
/boot/vmlinuz-5.8.10 is unsigned.
E: Your kernels are not signed with a key known to your firmware. This system
will fail to boot in a Secure Boot environment.
dpkg: error processing package grub-efi-amd64-signed (--configure):
installed grub-efi-amd64-signed package post-installation script subprocess
returned error exit status 1
This is not a bug in shim-signed, the package deliberately refuses to
upgrade informing you that upgrading will render your system unbootable.
/boot/vmlinuz-5.8.10 is not an official Ubuntu kernel, which means that
with recent versions of shim which enforce kernel signatures, your
system will fail to boot.
You need to either disable SecureBoot in your firmware, or use a signed
kernel.
** Changed in: shim-signed (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1902675
Title:
package shim-signed 1.40.4+15+1552672080.a4a1fbe-0ubuntu2 failed to
install/upgrade: dependency problems - leaving triggers unprocessed
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