Martina Neumayer on Nostr: Martin is right. Privileges are broken. If you can't change them back by the command ...

Martin is right. Privileges are broken. If you can't change them back by the command he written, it means that something block you from that because this directory is in use. Try to log out all users and log in only on the one account on this laptop. Next try this command once again from the terminal. If works do full reboot. If not only from the recovery terminal or TTY you will be able to change the ownership. When the system alone and none of the users are is logged into.