chmod: changing permissions of ‘/var/log’: Operation not permitted

This error message indicates that you do not have the necessary permissions to change the permissions of the `/var/log` directory. In order to change the permissions of this directory, you will need to run the `chmod` command as a user with sufficient privileges, such as the root user. You can do this by prefixing the `chmod` command with `sudo`, like this:

sudo chmod [permissions] /var/log

Replace `[permissions]` with the desired permissions that you wish to set for the directory. If you are unsure what permissions to set, you can refer to the chmod man page by running `man chmod`.