APLS 10.5.1 user guide is a pain. This user guide does not have following information. I got it from 9.3 user guide.
Hopefully, it would help someone like me.

Console Uninstallation To perform console uninstallation, do the following: In the Commandline tool, enter the directory path to the HPAutoPassLicenseServer folder found in the installation directory, as seen in the example below:
''/HPAutopassLicenseServer>''
Enter the command ''./ChangeHPAutopassLicenseServer-iconsole'' and press Enter The License Server is uninstalled.

If the Linux box has the UI enabled:
Enter the command ''./Change HP Autopass License Server'' and follow the instructions provided by the wizard.