Getting the trinity-keyring in Devuan can be tricky, I had to learn a 
system that worked,  First of course is to do the Devuan base install 
and then boot and login and do apt-get update and 'apt-get install 
trinity-keyring --allow-unauthenticated', now you can apt-get install 
tde-trinity, you will have to tell apt 'y' for yes when asked to install 
untrusted. After the install is done and you boot to the trinity desktop 
you can copy the trinity-keyring and run 'apt-key adv --keyserver 
keyserver.quickbuild.io --recv-keys (paste the trinity-keyring here)' 
and your good to go.  If you try to have a system without the keyring 
properly installed you are going to have system problems, so make sure 
you can install aptitude and can run aptitude dist-upgrade without problems.

Cheers!
-- 
Jimmy Johnson

Devuan ASCII - TDE Trinity R14.0.5 - AMD A8-7600 - EXT4 at sda6
Registered Linux User #380263