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As far as I'm aware, I'm supposed to be prompted for a password before anything installs, but just now, I told update manager to install updates, and it proceeded to installing them without prompting me for a password. This happened right after I logged on, so I wasn't prompted for my password beforehand for anything else either.

Is this normal and would it pose any kind of security risk?

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Look at your /etc/sudoers file (you'll need root permission to see it). Is there a line that's not commented out and says NOPASSWD? – Kevin Jan 27 '12 at 4:42
@Kevin: "NOPASSWD" doesn't exist anywhere in the file. I have a line that starts with "Default" and three others, with varying number of "ALL"s and punctuation. – howardh Jan 27 '12 at 4:48
up vote 2 down vote accepted

Maybe you should look into PolicyKit, as some update manager backend (such as the popular PackageKit) use it to authorize themselves.

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It seems this could be it. Where would I look to see what PolicyKit authorized? – howardh Jan 29 '12 at 4:06
Sorry I'm not quite familiar with it too, just know a little that it "works" :-( – Felix Yan Jan 29 '12 at 4:07

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