Hello notlurking,
Have you tried what is stated on this page:
https://wiki.trinitydesktop.org/Debian_Trinity_Repository_Installation_Instructions#Configure_the_package_managerMake this on EmmaDE4 on a terminal to open sources.list :
sudo geany /etc/apt/sources.list
Add this 2 lines on sources.list :
deb http://mirror.ppa.trinitydesktop.org/trinity/deb/trinity-r14.0.x bullseye main
deb http://mirror.ppa.trinitydesktop.org/trinity/deb/trinity-builddeps-r14.0.x bullseye main
Save sources.list, and make this on a terminal :
wget http://mirror.ppa.trinitydesktop.org/trinity/deb/trinity-keyring.deb
sudo dpkg -i trinity-keyring.deb
sudo apt-get update
sudo apt-get install tde-trinity
Replace lightdm by trinity on screen for configuration, and wait.
After install, reboot your computer, and you had to have this: