I can also confirm this bug with ubuntu 20.04 and isc-dhcp-server 4.4.1
I use the isc-dhcp-server as part of foreman infrastructure and with this bug it is not possible to automate the isc-dhcp-server from foreman.
The Problem was solved for the moment as I just compile the isc-dhcp-server from source and install it over the package... but this should not be the long time solution I think..
I can also confirm this bug with ubuntu 20.04 and isc-dhcp-server 4.4.1
I use the isc-dhcp-server as part of foreman infrastructure and with this bug it is not possible to automate the isc-dhcp-server from foreman.
The Problem was solved for the moment as I just compile the isc-dhcp-server from source and install it over the package... but this should not be the long time solution I think..
For whom ever interested this is my solution at this moment: https:/ /community. theforeman. org/t/foreman- proxy-failed- to-add- dhcp-reservatio n-for-new- vm/27091/ 3