unable to get exclusive lock

Asked by digdug

when i try to update i get the message "unable to get exclusive lock"
another package management application (like apt-get or aptitude) is already running please close that application first.
How do i know which one is running and then how do i close it? and what did i do to cause this error?
Thankyou for your help Ubuntu 8.04 rocks!!!!!!
oh and by the way the updates are sun java6-bin and sun java6-jre

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Ubuntu update-manager Edit question
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Solved by:
Fabián Rodríguez
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Abi ^-^ (abiyasa-eka) said :
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Best Fabián Rodríguez (magicfab) said :

Indeed, comments in https://answers.launchpad.net/ubuntu/+source/gnome-panel/+question/27524 will help you understand what's happened and work around it.

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digdug (digdug1120) said :

this helped (kinda) LOL im not computer savy but i just faked it !!! seems to work fine

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digdug (digdug1120) said :

Thanks Fabián Rodríguez, that solved my question.