I have OwnCloud 9.1.6 running on a Ubuntu 16.04 LTS server. It was installed with packages, so I understand I need to update it with packages. After a lot of hunting around I finally found the name of the repository to add, as I understand I have to bring v9 fully up to date before I can go to v10. However when I try to update it, I get an error that the repository isn’t trusted or some such. I didn’t see any instructions on how to add the key for the 9.1 repository. Would someone mind sending me instructions on how to fix that?
Also, once I’ve got v9 fully updated, can I go straight to the latest version of 10.0 or do I have to go 10.0.1, 10.0.2, etc?