I am still on byzantium, and not ready to upgrade. First I need make a full backup.
~$ sudo apt install dino-im
[sudo] password for purism:
Reading package lists… Done
Building dependency tree… Done
Reading state information… Done
dino-im is already the newest version (0.4.2-1pureos1).
0 upgraded, 0 newly installed, 0 to remove and 326 not upgraded.