Thanks for taking the time to report this bug.
This behaviour is by design, sudo doesn't time out for a few minutes. If
you want to change this behaviour see
http://ubuntuforums.org/showthread.php?p=116697
** Changed in: sudo (Ubuntu)
Status: New => Invalid
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update-manager has root privileges after sudo was used
https://bugs.launchpad.net/bugs/172695
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