Cannot update due to "shim-signed"

[Idiot Annon]

What do these commands show ?

Code:

ls -l /usr/lib/grub

Code:

file /usr/lib/grub/grub-multi-install

Here's the output:

Code:

 linuxlite  ~  ls -l /usr/lib/grub
total 80
lrwxrwxrwx 1 root root    34 sie  1  2022 grub-mkconfig_lib -> ../../share/grub/grub-mkconfig_lib
drwxr-xr-x 2 root root 36864 maj 14  2023 i386-pc
drwxr-xr-x 3 root root 36864 maj 12  2023 x86_64-efi
drwxr-xr-x 2 root root  4096 maj 12  2023 x86_64-efi-signed

Code:

 linuxlite  ~  file /usr/lib/grub/grub-multi-install
/usr/lib/grub/grub-multi-install: cannot open `/usr/lib/grub/grub-multi-install' (No such file or directory)