UPDATE: ignorance error: the package is dino-im, not dino.im
I was able to do an apt install for dino-im-common and for some reason I get an error when I attempt to do an apt install dino.im:
$ sudo apt install dino.im
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
E: Unable to locate package dino.im
E: Couldn't find any package by glob 'dino.im'
I think I must be doing something wrong? I tried doing a round of update/upgrade, etc. and I tried to add more to the name, e.g. dino-im/byzantium and perhaps I need to add more to it than that?