I revived an old netbook with Linux Mint 15 last year but haven't actually used the netbook in months. I've since forgotten the password and have been trying to get back in with these guides:
one - http://community.linuxmint.com/tutorial/view/339
two - http://www.mikaellinusson.com/tech/2012/11/16/linux-mint-reset-or-change-root-password/
three - http://www.howtogeek.com/howto/linux/reset-your-forgotten-ubuntu-password-in-2-minutes-or-less/
Unfortunately, I can't get past "Hold Shift on boot", as GRUB never appears; the netbook just goes straight to the login screen. I also tried pressing M for manual recovery, but it then asks for a root maintenance password, which just brings me back to my first problem. Any ideas?