is there a bug in 12.04lts software updater?

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http://ubuntuforums.org – installed 12.04lts a few weeks ago & haven't done much with it. today, when i booted up the desktop software updater in upper right corner said it was up to date but because I hadn't booted in a couple weeks I ran it anyway. it said 'not all updates can be installed' & offered a partial update or close. when I told it to do partial update it errored out saying apt-get or aptitude was running, which it wasn't as far as I know. I then did apt-get update from a terminal. it d/l a bunch & then exited normally. when i looked at the desktop updater it now said updates rea (Hardware)