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If you really want to protect with password, in case some one has physical access to your pc, will recommend two options

  1. Encrypt your drives partitions
  2. Set up grub password

First option will increase security but if you run on a server your will need to be there when it powers up so if for some reason it restart it will be waiting for you to insert the password Second option will only affect if some one wants to change grub, that way if some one reboot your machine to try to get into single mode he will need grub password. In case it reboots it will load default boot option and allow you to login. How ever if someone boots with another Linux live image he may be able to access your disk partitions, something he may not be able to do with option one.

Hope this help