1. First off you need to make sure that you have x11vnc installed:
   sudo apt-get install x11vnc
2. Now all you need to do is slap in the command to run the VNC server into the file “/etc/init.d/gdm”. Locate the start section of the script and just before the “;;” add the line:
   /usr/bin/x11vnc -safer -forever -nopw -loopbg -auth /var/lib/gdm/:0.Xauth -display :0
3. and your done you should now be able to access your Ubuntu with VNC with a login screen.

Before any body comments I know you should do it though inetd, but I’ve often had problems with that in the past so this is just something to allow you access from login with out the hassle of installing and configuring inetd.

1. The first thing you have to do is generate the keys, this is done on the machine that will be connecting from:
   ssh-keygen -t rsa
   This will generate the private and public keys need, they will be put in “~/.ssh/” by default called “id_rsa.pub”(the public key) and “id_rsa” the private key.
2. Now you need to copy this public key, “id_rsa.pub”, to the machine you will be connecting to, choose what ever method your comfortable with, ssh, ftp, smb – what ever
3. Now all you need to do is add this key to the file “~/.ssh/authorized_keys2″, the easist way is:
   cat id_rsa.pub >> ~/.ssh/authorized_keys2
   Then your done, you should no longer be prompted for a password when connecting.

Note: if this is the first time you are connecting it will still prompt you to add the machine to known hosts.