The error message displayed in this situation is as follows:
*** ERROR: Another instance of agentadmin is already running. Please stop that instance and try again.
This message appears when the first installation operation is aborted with the CTRL-z keystroke combination. This keystroke combination suspends the process, but does not actually stop the process. If other methods are used to abort the operation, such as the CTRL-c keystroke combination, this problem does not occur.
Workaround: When this problem is encountered, close the terminal window and open a new terminal window.