[other_os] linux mint12 failed to update...???

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http://ubuntuforums.org – i am updating it after its installation. At the time i try to update it by clicking on install update button it says fix broken packages first their are no broken packages as i see in synaptic..>? some day ago i had installed code blocks it has several broken packages however i have removed them but it i still showing error.(after removal of broken packages not all code blocks packages were removed). what is happening there? how to install updates?? (Hardware)