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I am trying to remote desktop from one Ubuntu machine to another. I can ssh from client to server successfully. On the server machine I set up everything that is mentioned in the guides (Remote Desktop Preferences), but every time I am trying to remote desktop to server from client I get error "Unable to connect". Do I need to set anything up on the server besides what I already did? Can I see somewhere why I couldn't connect?

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Did you install SSH 'server' on the target machine? The 'OpenSSH client' is installed by default on Ubuntu (desktop or server), which allows you to connect to a machine that has SSH server. sudo apt-get install openssh-server – david6 May 25 '12 at 4:39
Yes, I have it installed. When I tried to connect yesterday and was not successful on the server machine I got message that reads something like "Following machine wants to remote desktop to your machine.", I chose 'Allow' but still couldn't connect. I should mention that machine I am trying to connect to is a work machine and I am connecting from home. I don't have problem ssh-ing into work machine, but not sure if this is a good indicator that connection can be established. – akravets May 25 '12 at 13:40

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In Dash, find or search for Desktop Sharing, configure that and you can then graphically control another machine. This sets up a VNC connection that you can use. If there is no one on the other end when connecting to a machine, make sure that you require a password and disable "You must confirm each access to this machine"

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