Thanks for your bugreport.
This appears to be a configuration problem with your sudoers file:
$ sudo apt-cache policy packagename
>>> sudoers file: syntax error, line 17 <<<
sudo: parse error in /etc/sudoers near line 17
Please check line 17.
I make this a question
** Changed in: update-manager (Ubuntu)
Status: Incomplete => Invalid
** Converted to question:
https://answers.edge.launchpad.net/ubuntu/+source/update-manager/+question/89965
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update and upgrade programs do not work
https://bugs.launchpad.net/bugs/479251
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