Is there any way to prevent others including root account from resetting a user password? I'd like to protect my user account not to be logged in by others so that others can't see the mounted encrypted folder.
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No, you cannot prevent root from changing your password. The root user has full control of the system, and if someone can log in as root, they can change your password. Likewise, if another user has access to sudo, you cannot prevent them from changing your password.
You can protect your data by encrypting your home folder. Users who can use sudo (or log in as root) could still change your password, but would not be able to access your data after changing it.
To secure the computer from root or other users, you need root access yourself. If you own the computer you should consider:
- disabling the root user (or setting a password only you know)
- ensuring other users cannot use
sudo - limiting physical access to the machine when possible
- encrypting the hard drive (usually requires reinstalling Ubuntu).
Jon Pavelich
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