While trying to install Advanced Authentication server appliance, the following error is displayed: Server is already active for display 0. If this server is no longer running, remove /tmp/ .XO-lock and start again.
This issue can occur if you click Continue without selecting I agree in End User License Agreement. As a result I don't agree is automatically selected and Yes is selected on the next screen.
To resolve the issue, perform the following steps:
Run the installer.
Select I agree and continue installation.