The former Debian Installer (known as 'd-i installer' in some circles) and the use of its "preseed" method of installing has been deprecated as of 20.04.0, and will no longer be used in Ubuntu releases from 20.04.1 and later releases, as it has been replaced by the Subiquity ("Ubiquity for Servers") installer.

This is why the ISO's name was changed from 'server' to 'live-server'. The Ubuntu 18.04 release was released in both formats and they dropped the 'server' version for the Ubuntu 20.04 release. Hence, there is no Debian installer version of the 20.04 ISO and the Quest KACE tool that uses a preseed file is not compatible with Ubuntu 20.04. Please contact the software vendor to see if they have plans to support the Ubuntu 20.04 release and the new "Subiquity" installer.”

SDA K2000 currently only supports Ubuntu up to version 18.04 - The former Debian Installer (known as 'd-i installer' in some circles) and the use of its "preseed" method of installing.