kenhzzz wrote: Another process is using the packaging system database (probably some other Adept application or apt-get or aptitude). Please close the other application before using this one.
Did you reboot already? And the error still appears? Could you try to run an "sudo apt-get update" on the command line? Chances are there would be a verbose error message.
Regardless of this: I think you got a so called "lock" file somewhere lurking in your /var directory. The presence of that "lock" file tells 'apt': "hey wait, you can't touch the packages again now, you're already running!" ... except that it isn't true in your case. So the solution would probably be to remove that file. Can you please check if this file exists on your system?:
It should be zero bytes long and belong to 'root'. If it's there despite no instance of aptitude, adept, synaptic, apt or dpkg running then I'd say it's safe to remove it:
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sudo rm /var/lib/dpkg/lock
Hope this helps.