I tried to run a PyQt4 app, but got following error:

cannot connect to X server :0.0

It seems i need to install the "X server", what's this? How to install it easily?

Thanks a lot.

You'll need some sort of graphical environment locally, and (depending on what it is) might need to install a boatload of stuff on the Linode too. What OS are you running at home?

(In the X Window System paradigm, the "server" is what draws the pictures and stuff on your monitor, and the "client" is the program you're running.)

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Thanks for your reply.
I am using Linode VPS with Ubuntu 10.0.4.
I want to run a Python script which uses PyQt4.

I tried to start the Python script, i got that error.

I've used this to install a desktop on my linode:

apt-get install gnome-desktop

This will install Gnome and X. I do this because I use nxserver on my linode as a development server.

Another method instead of running an X server on your linode is to forward X over your ssh connection, like so:

[redice@redices-home-machine ~]$ ssh -X -C user@redices-linode

Then you can run your Python script on the linode, and whatever X stuff it does should appear on your desktop. This of course assumes you are running X on your home system.