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Update manager does not find any updates

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linux-howto

http://askubuntu.com – My update manager does not find any updates. It does not crash or anything, but no update for my ubuntu, except for the PPAs. At first I thought there really was no update out there, but now it has been more than a month since my last update. What is wrong here? $ cat /etc/apt/sources.list deb http://ir.archive.ubuntu.com/ubuntu/ precise main restricted universe multiverse (I also tried the MainServers, but still nothing.) $ sudo apt-get update [sudo] password for sahand: Ign http://ppa.launchpad.net precise InRelease Ign http://ppa.launchpad.net precise InRelease (HowTos)