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I lost the password for root on a ubuntu virtual machine. Is there any way to restore it or I need to install a new virtual machine with ubuntu again?

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up vote 3 down vote accepted

You can change your root password by running sudo passwd root

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ohhh great!!! I was desperated for an hour :-s thanks bro!!! – Hoang Pham Mar 20 '10 at 18:10

Ubuntu doesn't have a password for the root account, unless you explicitly enable it after installing. Sudo will ask for your current account's password, by default.

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