HowTo install OpenVPN server

[Tamadite]

thank you for your answer,

yes, a little help in configuring ubuntu will be appreciated

my network architecture is:

XP Laptop --- internet --- router(wl500g) --- Ubuntu Desktop

I want to access Ubuntu Desktop from XP Laptop over VPN

I do not understand why you need to establish a VPN between the Ubuntu desktop and the router. Please advice.

You wrote:

Now I have a functional vpn between my Xp laptop and wl500gp.

Please confirm you have understood FINAL NOTES point (ii). If I got it correctly, that should be the answer to your problem.