[ubuntu] System updates problem on a server

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http://ubuntuforums.org – Hello I am running 12.04 server with ubuntu-desktop installed on top. Every so often I get errors on startup and they refer to some package that needs updating. Sorry Ubuntu 12.04 has experienced an internal error. ... Unreportable Reason You have obsolete packages installed Please upgrade the following packages ... So I sudo apt-get update sudo apt-get upgrade My question what is happing to cause these packages to become obsolete ( is it just the passage of time and would setting the system clack back a few days make a difference? (i don't think so!) If it is that somethong has changed, (Hardware)