OK. I give up. After watching videos and reading reams of documentation, I'm not able to get Sculpt to shutdown. I can get it to reset - via:
vim config/managed/system <system state="reset"/>
which takes effect as soon as I write the file
but the corollary: <system state="poweroff"/>
doesn't appear to have any effect in either virtual box or the t430.
What I've been doing in the meantime, is the reset and then powering off during the reboot.
help.
Will