Nope, if keyrings-OLD is there, you have successfully renamed the directory. I'm satisfied with that.
Right, you're going to reboot now.
One thing though, if you are asked for any *new* passwords upon rebooting, it should be a one-time-only deal. If you are asked for a 'new keyring password', enter BLANK PASSWORD ONLY [in other words, leave the field blank] and press 'continue' or 'OK' or whatever it offers. You will not be asked for any new passwords again after this.
It may also ask you if you accept 'unsafe storage'. If it does, click yes and continue.
Do not enter any new passwords. Enter only your main password [the one you created when installing Mint] to login.
OK, close your eyes, think of England, and reboot for Queen and country.