I am facing some problems, I want to change login name on
Can any one tell me how to do that? Screenshot is attached for reference
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I don't believe you can change your sign-in name, as the login is based on the Ubuntu / Launchpad OpenID service, and the sign-in name is part of the URI that uniquely identifies your user.
To change your login details you can go at https://login.ubuntu.com and from there you can edit your name, manage your emails or change your password.