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You'll first want to install a VNC client on your computer. I recommend TigerVNC. To install TigerVNC on Ubuntu, run the following command:
sudo apt install tigervnc
If you are running Arch Linux, you can install it through Pacman by running the following command:
sudo pacman -S tigervnc
Then, ssh into the machine running the virtual machine and run the following command as root:
virsh vncdisplay <vm_name>
You will get an output similar to
127.0.0.1:1add 5900 to the last number to get the port the VNC server is listening on. In this case, the port would be 5901.
[you@yourcomputer:~]$ ssh -L 5901:localhost:5901 ras1.tjhsst.edu
[2019yyou@ras1:~]$ ssh -L 5901:localhost:5901 antipodes.csl.tjhsst.edu
Finally, open up your VNC client and connect to
127.0.0.1:<PORT>(in this example
5901). That's it!
Look at your VNC's manual to learn how to use it better. Mostly, though, keyboard and mouse input should pass right through as long as the VNC window is focused.
If you press Ctrl+Alt+Delete while connected via tty, you will reboot the machine, so exercise caution.