Run Ettercap without disabling kernel forward (/proc/sys/net/ipv4/ip_forward)
/proc/sys/net/ipv4/ip_forward
gksu "/usr/sbin/ettercap --gtk --unoffensive"
GTK display can also transported from remote host
Ask GDebi to install the .deb /usr/bin/python /usr/bin/gdebi-gtk virtualbox-3.1_3.1.6-59338_Ubuntu_jaunty_amd64.deb
/usr/bin/python /usr/bin/gdebi-gtk virtualbox-3.1_3.1.6-59338_Ubuntu_jaunty_amd64.deb