Ubuntu – How to change password using usermod

password

I am superadmin of a server and like to change password of an existing user . How can I do that ?

I tried

usermod -p 'new-password' john

but it didn't worked ?

The usermod -p flag is expecting the data to be the password already in an encrypted format.

Use openssl passwd to generate the encrypted data, or do it like this:

usermod -p `openssl passwd` (USERNAME)

You can just expire that password. After creating a new user foo, just type:

sudo chage -d 0 foo

And he will be forced to change it after first logon.

To do it using command line:

To change the root password:

sudo passwd

To change your user password:

passwd

To change other users password:

sudo passwd USERNAME

To do it GUI open the application User Accounts from the Dash and there you can change password easily for all users unless the root