[ubuntu] Update manager and passwords

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http://ubuntuforums.org – Hi I've searched the faq's but not found an answer to the following. (I'm running 12.04lts ) I thought Linux/Ubuntu always asked for your password before installing upgrades / new packages. I've just run update manager today and it installed 13, (I think), upgrades without asking for a password. Is this OK? I thought passwords were the root basis of Linux security. Being a long time Windows user I am paranoid about viruses. (Hardware)