📚 Shutting down not powering off the computer

I erased everything and did a clean install of ubuntu 20.04, and the PSU keeps running even after shutdown. I never had this problem when I was using windows. I already tried the grub edit, "acpi=force" and "apm=poweroff", but its shows this warning on the terminal: "GVfs metadata is not supported". And if I make any changes to grub file there's this long string of messages ending with "grub failed boot detection" on startup. All the fixes I found seem to be very old.

sorry about my english