Yes, I suppose
that the sd-card was to small (2 GB only).
Now I use a bigger sd-card and the q4os image which has trinity
installed and it runs pretty good.
Having read your message I tried q4os. While TDE runs, I can't install kmail
(I get a bunch of unsolved dependancies).
Did you get kmail installed?
I didn't try it, because that is not my use case. I need a gui for a few
programs for an electrical workbench.
Rolf