Thanks, but for me it still doesn't work.
I ran the Firmware upgrade DVD which updated P420i Controller Firmware from 4.68 to 5.22 and installed hpacucli 9.40.1-1 via the deb file. Still got the same error mentioned above. Then I upgraded to the newest Controller Firmware 5.42 and still have the same error. Hpacucli shows me this version:
root@servername:~# hpacucli version
ACU CLI Version: 9.40.12.0
SoulAPI Version: 6.2.25.0