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I have kodi 
17.8-136
running.

running 
sudo apt-get install rbp2-mediacenter-osmc
does not uipgrade to latest verion, but saying I am having the latest, which I do not have it is already 17.8.-16x available 

apt/sources:

deb http://ftp.debian.org/debian stretch main contrib non-free

deb http://ftp.debian.org/debian/ stretch-updates main contrib non-free

deb http://security.debian.org/ stretch/updates main contrib non-free

deb http://apt.osmc.tv stretch main

#deb http://download.osmc.tv/dev/gmc-18 ./


what am I doing wrong?

thanks