Help migrating everything to new self manged Gitlab server from older version (not available in Ubuntu repos)?

I have a new (self managed) Gitlab server that I would like to migrate all of the data from an older server to. The older server is using package version

gitlab-ee-10.6.4-ee.0.el7.x86_64 on CentOS 7

and I am trying to migrate it to an Ubuntu 20.04.2 server.

Looking here ( Back up and restore GitLab | GitLab ), I have already backed up the data via “gitlab-rake gitlab:backup:create” command as well as saved the existing gitlab.rb and gitlab-secrets.json files.

However, I see now ( Back up and restore GitLab | GitLab ) that I need the same version and type in order to do the transfer, but looking at the Ubuntu repo (sudo apt-cache madison gitlab-ee), I see no version older than 13.2.0-ee.0 and it would appear that I need the 10.6.4-ee.0.el7 version for my Ubuntu server. (Found out after installing the newest version initially and then trying to follow the instructions for downgrading ( Downgrade | GitLab )).

Anyone know how I can resolve this? BTW, is it a problem that the older version is for CentOS 7 and the new verision I’m trying to migrate to is on Ubuntu? Is there an easier way to migrate everything?

Thank you