got error when install utorrent "failed to create symbolic link `/usr/sbin/utserver’: Permission denied"

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http://askubuntu.com – i want to ask why i got this error on my terminal when i'm install utorrent?? i've followed the tutorial from this ubuntu tutorial and i stucked on this command : sudo ln -s /opt/utorrent-server-v3_0/utserver /usr/sbin/utserver i'm noob on linux and ubuntu, so please gimme some suggestion or advice to solve this problem, thank you so much (HowTos)