I experience the same problem: I installed Armbian without desktop (both the Debian and Ubuntu version) to install a minimalistic desktop setup afterwards.
However, in the armbian-config tool I do not find the "Desktop" option when entering the "System" menu.
The installation instructions mentioned in the documentation (Desktop Environments - Armbian Documentation) are not working either.
I'm using Armbian 25.11.1 dzsnlr 6.12.58-current-bcm2711 (Debian trixie) on a Raspberry Pi 4 8Gb.
Thanks a lot for any hints how to get a minimal desktop installed without relying on the images with desktop included!
