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I want to access an Ubuntu machine remotely via VNC. But I can access the Ubuntu machine only if the user is logged in. I want to access the ubuntu machine via VNC from the login screen itself. We can access all windows machines from the login screen. However we were not able to access the Ubuntu machine from the login screen. There is some way but I am not aware of the details. Can someone give a solution to this problem?

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If the other machine is on the same LAN it would be feasible to just use XDMCP instead of VNC. If it's not on the same LAN, unaccelerated X over the network might be too slow. –  Robin Green Apr 16 '11 at 7:05
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2 Answers

up vote 8 down vote accepted

Your best bet is to install xrdp Install xrdp. After installation, you can use an RDP client to connect to the machine - you will then be prompted for your credentials as you would be on the login screen.

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I have installed xrdp but still i am unable to access the ubuntu machine from the login screen. –  karthick87 May 17 '11 at 12:34
    
@karthick: Are you connecting to the machine with VNC or using an RDP client? –  Nathan Osman May 17 '11 at 15:48
    
I dont find RDP client in my machine. Where it will be located ? –  karthick87 May 18 '11 at 5:43
    
@karthick: Are you using Ubuntu as your client? If so, the program to use is called "Terminal Server Client". On Windows, it's called "Remote Desktop" IIRC. –  Nathan Osman May 18 '11 at 6:15
    
Yeah thank you. Is it possible to create a launcher for Terminal Server Client ? –  karthick87 May 18 '11 at 7:05
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To enable GDM login over a VNC ssh remote connection try with X11vnc. See also this answer.

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