Hi,
I am running Ubuntu Xenial on my Rasberry Pi 3 and I was wondering if there is a chance for a official ARMHF Omnibus package for it (like the ones for Debian and Raspbian right now). Xenial does have a gitlab package in its repos but its broken currently (missing ruby gems) and does not seem reliable right now. I have had and excellent experience with the x64 Ubuntu Omnibus package (install and update for more than 1 year and counting 
).
Hope someone from the packaging team seems this
I haven’t tried it yet myself, but I suspect that you can use the Raspbian package on any Debian flavor that runs on RPi, including Ubuntu.
It can’t hurt you to try it - worst case it just won’t install properly and you’ll remove it.
I would try using the manual installation instructions here: https://packages.gitlab.com/gitlab/raspberry-pi2/install#manual
I will probably give this a try, but it would be nicer to have an official package (so you can just apt-get upgrade). Ubuntu is a popular and large distro for Pi, and a version should be made available.