If the update manager gets stuck at a package download and then you can't use "apt-get install" due to errors like dpkg locked and you try rm /var/lib/../../lock and it still does not work then do the following
check the output of this command:
ps aux | grep http
This will result in 2 or 3 lines with the second column of each line being the pid of the process if the process is doing its job. If the result is just 1 line, say the last phrase being grep http or something, the updates are not being downloaded/installed. Its safe to kill the update manager
To do this:
run: ps aux | grep update and note the pid of the update-manager being the second column after your user name in the 2/3 line list of output. Let the pid of update-manager be pid
Kill this process by running:
kill -9 pid
If operation is not permitted, try with sudo, but take care that you don't kill any other process. Note the pid of update-manager carefully.Source - http://ubuntu.aspcode.net/view/635400140124705175239668/how-to-cancel-update-manager-downloading-flashplugin-installer
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