Install LOIC for ubuntu

sudo apt-get install git-core monodevelop

mkdir ~loic
Download script http://www.4shared.com/file/rly7YCfe/loic.html
mv loic.sh /home/bhior/~loic
cd ~loic
chmod a+x loic.sh

Install LOIC
./loic.sh install

Update LOIC
./loic.sh update

Run LOIC
./loic.sh run

Source: http://remote-execution.blogspot.com/2011/04/instalacao-e-uso-do-loic-no-linux.html

Or: Install from
http://sourceforge.net/projects/loic/
https://github.com/NewEraCracker/LOIC/downloads
thanks!