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New to Ubuntu and "sudo" command.I've successfully installed 22.04.2 on Virtualbox. During the install it asked for a user and password which I entered. After logging into the Ubuntu desktop with user created, using sudo to update system asks for password, then fails with 'user is not in sudoers' file. What do I do from here? I can't update the system or install anything. Thanks.

tom_ep
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