So far so good, Thank you mwillms
Here is what I did to allow mediacenter to install on the odroid C2:
1) Install stock Ubuntu (16.4)
2) setup the odroid DAC as per odroid reference :
http://odroid.com/dokuwiki/doku.php?id=en:c2_hifi_shield. (A wrong dac ship can still provide sound through I2S)
echo "snd_soc_pcm5102" >> /etc/modules
echo "snd_soc_odroid_dac" >> /etc/modules
3)Reboot
4) Install architecture ARMHF:
dpkg --add-architecture armhf
apt-get update
apt-get install libc6:armhf
The line "apt-get install nameofpackage:armhf " mentionned in the Pine64 howto is not worknig on the odroid.
5)Reboot
6) Proceed with the installation process of mediacenter as for the pi.
Odroid C2 works like a charm with JRiver and an external I2S DAC (DDDAC with pcm179x)
PS : if anyone know how to install a driver "snd_soc_pcm179x" that would be great as it is not present in the Ubuntu 16.4 from Odroid.
Hope this can help