Fresh Install Gitlab-ce 8.17 on Debian 8 Jessie not working

Trying to install latest Gitlab-ce on a new Debian 8 machine. Got this error :

/opt/gitlab/bin/gitlab-ctl: /opt/gitlab/embedded/bin/omnibus-ctl: /opt/gitlab/embedded/bin/ruby: bad interpreter: No such file or directory
dpkg: error processing package gitlab-ce (--configure):
 subprocess installed post-installation script returned error exit status 126
Errors were encountered while processing:

E: Sub-process /usr/bin/dpkg returned an error code (1)

All the files listed above exist
Here is my configuration : Linux 3.16.0-4-amd64 on x86_64 (I had to do dpkg --add-architecture amd64 to authorize this package on my i386)
Found nothing similar on the web
Thank you for help