Make sure the dongle is connected, check with dmesg.

If the bluetoothdongle is not working try restarting the service

sudo /etc/init.d/bluetooth restart

look at Ubuntu bluetooth if he dongle does not work after restarting the service.

interfaces

#Uncomment this to let network manager do the configuration
auto lo
iface lo inet loopback
 
#auto eth0
#iface eth0 inet static
#address 144.41.176.69
#gateway 144.41.176.1
#netmask 255.255.255.0
#nameserver 144.41.5.20
 
#Only use this if eth0 is not working. With this enables you cannot connect via wireless
#auto eth1
#iface eth1 inet static
#address 144.41.176.68
#gateway 144.41.176.1
#netmask 255.255.255.0
#nameserver 144.41.5.20

hosts

#Armadillo Frobobox 
144.41.176.69 froboboxcable  #eth0 gigabit cable
192.168.0.2   frobowireless  #eth1 connect to wireless router in frobobox