You're welcome, no problem that you are raising your opinion about the installation process, feedback will help make things better. The Phython dependency was there for a reason but I don't see it in the current installation doc so that is progress. The special users are due to using Gitolite, it is better to give it a separate unix user. The database requirement is needed unless you use SQlite, but support for this was dropped in 4.0 (and support for PostgreSQL made a lot better) because of the locking of SQlite. For sure GitLab is meant to run on a server and not on your development machine, did you get another impression from the readme description ('code hosting application')? What did you think it did?