[tde-users] Install not possible from Ubuntu Live CD's

I followed the link to Ubuntu Live CD's with Trinity Desktop (http://mirror.ppa.trinitydesktop.org/trinity/cdimages/ubuntu/) where I found two versions of a Live CD: tde-14.0.8-ubuntu-20.04-desktop-amd64.iso 2020-Apr-27 23:16:49 1.6G application/x-iso9660-image and tde-14.0.9-ubuntu-20.04.1-desktop-amd64.iso 2020-Nov-06 04:36:35 1.6G application/x-iso9660-image I made USB install sticks for both of them and found the same error: both can be started without problems on different notebooks (Sony VAIO, Lenovo T520, Samsung NC10) and run smooth and error free from the stick. Whenever I try to do an installation - started the Live CD in the mode with possible install - on each of the nb's I always end up without a starting install process directly out of the start of the image but end up in a Trinity Desktop where I find links to install Ubuntu with Trinity. But when I use of the menu entries nothing happens and no message is shown. By fetching the install entry's command line out of the menu editor and calling it from a command line nothing is shown too. And when I => sudo -i and then => --preserve-env=DBUS_SESSION_BUS_ADDRESS,XDG_RUNTIME_DIR sh -c 'ubiquity gtk_ui' I only get the message "Could not find command-not-found database. Run 'sudo apt update' to populate it. --preserve-env=DBUS_SESSION_BUS_ADDRESS,XDG_RUNTIME_DIR: command not found" By running only the part "ubiquity gtk_ui" again I do not receive any message and an install is not started. The hole process of starting the image from the stick looks very similar as a normal install process for Ubuntu where the installation is directly started after choosing this option from the images start menu. When I do this with the Trinity images the install process is NOT started. Both versions do exactly the same. It would be very nice to get help on this because I figured out that the combination of Ubuntu 20.04 and Trinity 14.x even when started from a stick after boot run more but fast enough to be used as a very good alternative to Kubuntu even on old hardware like a Samsung Netbook NC10 from 2011 with 2 GB RAM and ARM450 CPU. So it would be nice to have the option to install from the Live CD's. Many thanks in advance !!!