failed to create symbolic link ‘/usr/bin/utserver’: File exists
You were attempting to create the link before and failed. Remove the link and try again:
sudo rm /usr/bin/utserver
sudo ln -s /opt/utorrent-server-v3_0/utserver /usr/bin/utserver
You can also tell ln to ignore already existing files and just overwrite them using the -f (or --force) option:
sudo ln -sf /opt/utorrent-server-v3_0/utserver /usr/bin/utserver
Warning! Use this option with the same caution with which you would use rm - it does the same: deleting already existing files under that name!
Excerpt from man ln:
-f, --force
remove existing destination files