I've been googling away. Unfortunately my linux skills consist primarily of hoping it all works without much intervention...

It appears that ubuntu does not arrive with a DHCP server, so one must be installed separately. Apparently the most common is isc, though isc says it is no longer maintained and one should use kea. kea looks way more complicated to configure, but it that's what is need I shall have a go at it.

It is still a total mystery to me how it ever worked in the first place (and why it stopped working), if it is indeed true that there is no built-in DHCP service. I have searched through Rob Lancaster's astropi3 script for ubuntu (which I used for my installation), and find nothing about installing any of the DHCP servers or configuring DHCP.

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