[LightDM] Remote login to Ubuntu with VNC

Robert Ancell robert.ancell at gmail.com
Wed Nov 16 15:34:31 PST 2011

Hi Jean,

I couldn't find a passwordFile option, what version of Xvnc are you
using?  In TightVNC there is a -rfbauth option, does this do what you

Is this the requirement this fulfils:
- You want only certain clients to be able to log in via VNC, using a
special VNC authentication step.
- Once authenticated they are shown the normal login screen and use
their standard authentication to continue.


On 17 November 2011 02:51, Jean-Michel Bouffard <jmbouffard at gmail.com> wrote:
> I want to add access to my Ubuntu 11.10 machine over vnc. I tried two things
> that are not exactly working as I want.
> First I simply tried to run Xvnc with the following  command:
>> sudo /usr/bin/Xvnc :1 -query localhost -geometry 1680x1050 -depth 16 -once
>> -fp /usr/share/fonts/X11/misc -DisconnectClients=0 -NeverShared
>> passwordFile=/root/.vncpasswd
> This option works but when I connect to my vnc server it stays in the
> default X view and never goes to the login screen. I had a similar problem
> with previous versions of Ubuntu but I could activate "remote login" in gdm
> but I cannot find an equivalent option in lightdm in Ubuntu 11.10. Is there
> any equivalent option?
> Next, after googling for a while I saw that lightdm is natively supporting
> Xvnx so I added these lines in lightdm.conf as mentioned in the
> documentation:
> [VNCServer]
> enabled=true
> port=5902
> width=1680
> height=1050
> depth=8
> In this case I can connect to the server with vncclient but I always get "No
> password configured for VNC Auth". I tried to run "sudo vncpasswd" to set a
> root password for xvnc but it does not work. I also specified "sudo
> vncpasswd /root/.vncpasswd" and "sudo vncpasswd /root/.vnc/passwd" because I
> tought these were the default pw files for root but it did not work. In
> /var/log/lightdm/lightdm.log I can see that ligthdm calls "/usr/bin/Xvnc :1
> -auth /var/run/lightdm/root/:1 -inetd -nolisten tcp -geometry 1680x1050
> -depth 8" but no passwd file is specified. So how could I specify a password
> for this VNC access?
> I hope I included enough details. Thanks for you help...
> --
> Jean-Michel
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