Mike, adding the PSB repo you suggested in your msg resulted a failure in reloading the list

$ sudo apt-get update

E: Malformed entry 16 in list file /etc/apt/sources.list (Component)

E: The list of sources could not be read.

Any help? Is going back to Debian 10 really the only way for me to use Trinity (for now)?
Also one more thing, what does PSB stand for exactly? Is it like a developmental branch?