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In ubuntu by default the su (root) password is not not set. I have set it by using the sudo passwd (see link). But I didn't like it. Can I go back to my original state.

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Tummala Dhanvi
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  • I believe you're looking for [this](https://help.ubuntu.com/community/RootSudo#Re-disabling_your_root_account). – saiarcot895 Jul 30 '14 at 16:09

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The root account in Ubuntu is defaultly disabled. When you enabled the root account (set a password for it) then you can disble it easy by the following command:

sudo passwd -dl root
  • -d means to delete the password (make it empty)
  • -l means lock the password of the account
chaos
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