so you are using a stock,standard Ubuntu 32bit install?
let me google that for you;Failed to execute child process "su-to-root"
http://ubuntuforums.org/showthread.php?t=969568
have a read at some of the posts in the above thread
you might choose the solution in post #16 sudo apt-get install menu
what does
now yield?sudo dpkg -l | grep cnijfilter
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