He did this last time when I left my laptop at room. Opened the system recovery mode from advanced Ubuntu options and changed the password using 'passwd usrname ' command.Is there anything I can do for this to not happen in future.
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For this user case probably the best "solution" is to re-install Ubuntu with full encryption (LUKS). This would secure the data and prevent changing the root/users password(s).
This could be defeated with a few methods, both hardware (key loggers) and software (custom kernels), but both of those options are unlikely. The OP can assess these risks.
With the above suggestion, I agree with the advice that the ultimate solution is to prevent physical access. In general physical access is root access via any number of techniques.
Panther
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Yes. Set the root password. Open a terminal, and do:
sudo passwd
Enter a password. Then the root shell in recovery mode will always ask for this password.
Note that all this is futile as he can boot into a live USB and change your password.
Ultimately, given physical access, the security battle is lost.
muru
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