i just created a test droplet with GitLab app.. and found little error after installation..
After login as root.. the following information are shown:
But the username is not correct.. it wasnt possible for me to log in with that username..
The correct username should be root.. so probably you can update your scripts.
While not on point, you can deploy GitLab on a DigitalOcean droplet rather easily, if you follow: https://www.digitalocean.com/community/articles/how-to-set-up-gitlab-as-your-very-own-private-github-clone
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