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ufff I upgrade my instance with amazon ec2 . I login again with my keypair and OK I am there User ubuntu

Now I make sudo su or sudo -i and now the system ask password . What password I not setup any password . The update or Upgrade of Amazon ec2 is a big problem . Now I can access but I can gain user root

Any ideas how to solve that

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What AMI are you using. Amazon does not provide their own Ubuntu images if I remember. – PHGamer Aug 30 '11 at 19:06
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If this is an EBS device, you can mount it on another machine and modify the /etc/shadow file.

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