This morning I tried to update to 1.2.0 on Ubuntu 16.10 and failed.
First I tried the equivalent of
sudo /usr/sbin/Orthanc /etc/orthanc/ --upgrade
and that did nothing. I shut down orthanc.
Then I tried to add
deb http://ftp.de.debian.org/debian stretch main
to my repositories and got a message saying the package wasn't signed and thus could not be read. I removed it.
Then I downloaded orthanc_1.2.0+dfsg-1_amd64.deb. That brought up a GUI which allowed me to install, but it kept coming back with 1.1.0.
I went to synaptic, found Orthanc, and did a complete removal. Then I tried again with what I downloaded. Initially it showed 1.2.0 in the details of what it was about to load. The install button did nothing the first time around and came back to 1.1.0 on the details the second time around.
I could use the Remove button to remove 1.1.0 and try again with 1.2.0 but it would never install it - only 1.1.0.
I searched my disk for orthanc. I found orthanc_1.2.0+dfsg-1_amd64.deb in /var/cache/apt/archives and it is part of the Ubuntu repository. Apparently I can't get around what Ubuntu wants to install (1.1.0) in order to install 1.2.0. Perhaps if the package were signed, it might work.
It isn't urgent to install the latest version, but it would be convenient to be able to work with the latest version, and see what else it has to offer.
Thanks,
Ilan