Boot the HP thin client from an Ubuntu Desktop 24.04 usb, and then follow this procedure
to install the HA-OS to the built-in SSD.
Then simply remove the USB and reboot.
You get a HomeAssistant prompt on console 1, and a root prompt on console 6 (just press enter)
The web console is available at http://192.168.2.8:8123
, first create a user.
and plug a P1 usb meter in the HP thin client. Also you can enable some initially disabled entities, like voltages and current.