Sorry, i deleted that, because it looks like you deleted your question.
They must have moved it. My emby is in opt. I would say that pretty much confirms you are on the old version.
Do this:
Login to terminal:
Code
wget https://github.com/MediaBrowser/Emby.Releases/releases/download/3.4.1.0/emby-server-deb_3.4.1.0_amd64.deb
Then
Please make sure you have backups. You may find you have to remove the old Emby first, I think I read somewhere.
Edit: Urg... long day, making mistakes. Corrected dpkg command with just file name and not download link