[ubuntu] Video issue

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http://ubuntuforums.org – Hi, when I try to run a video file on my Ubuntu it says: The playback of this movie requires a XVID MPEG-4 decoder plugin which is not installed. I tried sudo apt-get install xvid but it gives the error: 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? Any suggestions? Thanks (Hardware)