Linux Mint 22.3

Trinity 14.1.6 (KDE 3.5 Fork)

Install as described on Trinity homepage.

https://wiki.trinitydesktop.org/Ubuntu_Trinity_Repository_Installation_Instructions

If TDE is not listed in your sessionmanager, and you don't have this file:
/opt/trinity/bin/starttde

then run this command:

sudo apt install --fix-missing tdebase-trinity tdebase-trinity-bin

That fixed it for me.