Ubuntu, a popular open-source Linux operating system, includes a Virtual Network Connection (VNC) program. The VNC program is used to access the Ubuntu computer from a remote computer, as well as to connect from the Ubuntu computer to other computers. If the program runs for a long enough period of time, it may cease to work. You must restart the program for it to function normally.
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Log in to Ubuntu as the root user. If you can't log in as root, log in as a normal user, open a Terminal and then type "su." Enter your root password to gain root privileges.
Open a Terminal window, type "vncserver -kill" and press "Enter" to stop the VNC service.
Type "vncserver" and press "Enter" to restart the VNC service.