How to fix E: could not get lock /var/lib/dpkg/lock - open (11 resource temporarily unavailable) in ubuntu 12.04

Use the following commands to resolve this problem

1. Search for processes
ps -A | grep apt-get

2. See if there is any process running as apt-get then kill that process using the process id
sudo kill -9 <process id>

for example: if the process id 9119 then command will be sudo kill -9 9119

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Use Case Diagram for Online Book Store

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