installation Error

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http://askubuntu.com – Whenever I try to install any software through Terminal or Software on my Ubuntu 11.04, I'm getting this response: In Terminal: E: Could not get lock /var/lib/dpkg/lock - open (11: Resource temporarily unavailable) E: Unable to lock the administration directory (/var/lib/dpkg/), is another process using it? In Software Center: An unhandlable error occured There seems to be a programming error in aptdaemon, the software that allows you to install/remove software and to perform other package management related tasks. What should I do? (HowTos)