This indicates that a software signing key for chrome may be missing from your system. This is stopping your update/upgrade from working.
To help diagnose the problem, please can you open a terminal - by pressing Ctrl Alt and T together.
In the terminal window type or paste in this command followed by Enter.
ls -la /etc/apt/trusted.gpg.d/This will show what keys you have installed in that directory.
Copy the output and paste it back here.
This is the result:
linuxlite ~ ls -la /etc/apt/trusted.gpg.d/
totale 32
drwxr-xr-x 2 root root 4096 mar 16 08:54 .
drwxr-xr-x 8 root root 4096 mag 30 2022 ..
-rw-r--r-- 1 root root 9444 mar 16 08:56 google-chrome.gpg
-rw-r--r-- 1 root root 0 gen 8 2023 skypeforlinux.gpg
-rw-r--r-- 1 root root 0 gen 8 2023 teamviewer.gpg
-rw-r--r-- 1 root root 1203 feb 23 2020 trusted.gpg
-rw-r--r-- 1 root root 2794 mar 27 2021 ubuntu-keyring-2012-cdimage.gpg
-rw-r--r-- 1 root root 1733 mar 27 2021 ubuntu-keyring-2018-archive.gpg
linuxlite ~ ^C
tks for your helping
