Been a while since I did GPU mining. Back in the day I used something like BAMT and everything was automatic. Getting ethminer to work in Windows is a pain.
I would like to use Xubuntu but can't find any instructions anywhere.
The best I can find is in some other forum
(going by memory)
with amd gpu's
with ubuntu 64
Install the fglrx driver
install go-ethereum
install cpp-ethereum
(in terminal)
geth console
admin.newAccount()
(remember your password)
eth.coinbase
( is your account number,remember it)
admin.startRPC("127.0.0.1", 8545, "*")
(start other terminal)
cd cpp-ethereum/build/ethminer
( or your ethminer folder)
ethminer -D 33000 to load the DAG
ethminer -G --opencl-device 0
(do this for each gpu in a seperate terminal
if it says gpu memory fault, ctrl-c and restart it
if it says core segmentation, make sure you are not starting it on the cpu)