Trouble in accessing `/home/USERNAME/.Xauthority'

[NoOp]

On 03/17/2010 02:27 PM, Tom H wrote:
>>> I'm a beginner user of Ubuntu(and also Linux), using Ubuntu 9.10.
>>> I tried to setup linux-firewall.org using this steps(as mentioned in
>>> www.linux-firewall.org):
>>> 4. Run the following commands:
>>> sudo lfwsetup
>>> sudo ln -fs ~/.Xauthority /root/.Xauthority
>>> sudo chown USERNAME.root ~/.Xauthority
>>> (you will have to replace USERNAME with your username)
...
> 
> Step 4 will only work in Ubuntu pre 9.10.

Can you explain please?