root@ubuntu:~/sec# sudo apt-get install rarcrack
Reading package lists... Done
Building dependency tree
Reading state information... Done
rarcrack:i386 is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
root@ubuntu:~/sec# rarcrack english.zip
-bash: /usr/bin/rarcrack: No such file or directory
root@ubuntu:~/sec# which rarcrack
/usr/bin/rarcrack
root@ubuntu:~/sec# rarcrack english.zip
-bash: /usr/bin/rarcrack: No such file or directory
root@ubuntu:~/sec#

apt-get install libxml2-dev build-essential
wget http://surfnet.dl.sourceforge.net/sourceforge/rarcrack/rarcrack-0.2.tar.bz2    tar -xjf rarcrack-0.2.tar.bz2
cd rarcrack-0.2
make
sudo make install
rarcrack something.rar --type rar

sudo apt-get remove unrar
sudo apt-get install unrar-free