Hello.
Can I use my Graphical Desktop without X ?

Thank you.

U need an X server to do UI (or something to tell the video h/w to draw something) X UI is different (from Windows) because it runs in a separate process and x clients have to use Unix sockets to communicate to it...tell it what to draw, it runs using root privilege, lightDM (ubuntu uses this) is a display manager that is an X client, it creates the log in screen (and does let u login)

I you can get Wayland to work, maybe yes

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Yup, this would be the only way, is if you were able to get wayland to function 100. Currently most distro's AT BEST have a bare skeleton of Wayland support, and none that I'm aware of have attempted to move 100% to Wayland.

http://sourceforge.net/projects/rebeccablackos/

As I understand it things can be done with frame buffer but, as mentioned, without X a desktop isn't really viable unless a replacement is found.
This laptop does let me select Gnome on Wayland and it works -- but I use XFCE and it's not moved to Wayland yet and my desktop has an NVIDIA card so I'll
not use it for a while.
I've played with Rebecca Black Linux but Debian Sid works better with Wayland on this machine.

For security reasons, someone disable X.
Wayland can work like other Desktop?

If this "someone" isn't you, then I doubt you will be able to install anything else.

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XWindows/XOrg is the foundation software behind any "graphic user anything." It's a non-privileged userland pair of processes: a client, and a server.

This is what allows you to, for example, connect to a remote machine (that doesn't even have a graphics card ...) and conduct a GUI session with that machine. As long as the remote is running the X server, you can connect. (And it does not use the crappy bitmap-transfer method that Windows Remote Desktop is obliged to use. The graphics are being rendered directly on your machine, by the client.)

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This is only true if your software runs on the ancient Motif/lesstif toolkit. Modern toolkits, like Qt or GTK, do the rendering on the server side and transmit bitmaps. On modern systems the Xorg network capabilities are not much more than a crappy implementation of VNC.

You don't own the machine so ask the owner to help. I'm guessing this is a server though so any kind of desktop is just more ports exposed to the internet -- just learn to work on it via the command line.
When you think about it this is a bizarre request "How can I run desktop applications on a machine that somebody has disabled X on?". When you put it like that the answer is "You can't, that's why they disabled X".

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Thus, It is not True that Graphical system like Xorg can cause hacking?

Using X locally on a server and ensuring that none of its ports are open to the internet is probabky not that much of a threat, but it's one that the people who own the server evidently don't want to take. They probably also do not run X because they don't want you playing Minecraft over a remote X session and causing them to use more electricity powering and cooling the machine you rent from them.
Edit: sorry, just occurred also. The admins probably want to avoid the whole "application X opens port through firewall under circumstance y under a blue moon, or causes 100 RAM usage on VM host" problem. Adding a desktop is adding more potential problems and holes.

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so this wayland.. what are its benefits over x server? why would someone switch to wayland assuming they could get a desktop environment to use it?

Can you not read?
https://en.wikipedia.org/wiki/Waylan...er_protocol%29
https://en.wikipedia.org/wiki/X_Window_System