Error 422 after installing Gitlab on Ubuntu 16.04

Hello, i'm a new linux user and i am having issues to access gitlab on my web browser
I'm trying to use my localhost to access gitlab.
external_url "https://127.0.0.1:8080"

Can somebody help me?

Summary

When i reach the "Logging In for the First Time" part, the login screen show up but when i try to change the password i get the 422 the change you requested was rejected error.

Steps to reproduce

I'm following this tutorial: https://www.digitalocean.com/community/tutorials/how-to-install-and-configure-gitlab-on-ubuntu-16-04

What is the current bug behavior?

The change you requested was rejected.
Make sure you have access to the thing you tried to change.

Please contact your GitLab administrator if you think this is a mistake.

Results of GitLab environment info

root@lorena:/etc/gitlab# sudo gitlab-rake gitlab:check SANITIZE=true
Checking GitLab Shell ...

GitLab Shell version >= 8.3.3 ? ... OK (8.3.3)
Repo base directory exists?
default... yes
Repo storage directories are symlinks?
default... no
Repo paths owned by git:root, or git:git?
default... yes
Repo paths access is drwxrws---?
default... yes
hooks directories in repos are links: ... can't check, you have no projects
Running /opt/gitlab/embedded/service/gitlab-shell/bin/check
Check GitLab API access: OK
Redis available via internal API: OK

Access to /var/opt/gitlab/.ssh/authorized_keys: OK
gitlab-shell self-check successful

Checking GitLab Shell ... Finished

Checking Sidekiq ...

Running? ... yes
Number of Sidekiq processes ... 1

Checking Sidekiq ... Finished

Reply by email is disabled in config/gitlab.yml
Checking LDAP ...

LDAP is disabled in config/gitlab.yml

Checking LDAP ... Finished

Checking GitLab ...

Git configured correctly? ... yes
Database config exists? ... yes
All migrations up? ... yes
Database contains orphaned GroupMembers? ... no
GitLab config exists? ... yes
GitLab config up to date? ... yes
Log directory writable? ... yes
Tmp directory writable? ... yes
Uploads directory exists? ... yes
Uploads directory has correct permissions? ... yes
Uploads directory tmp has correct permissions? ... skipped (no tmp uploads folder yet)
Init script exists? ... skipped (omnibus-gitlab has no init script)
Init script up-to-date? ... skipped (omnibus-gitlab has no init script)
Projects have namespace: ... can't check, you have no projects
Redis version >= 2.8.0? ... yes
Ruby version >= 2.3.5 ? ... yes (2.4.4)
Git version >= 2.9.5 ? ... yes (2.18.0)
Git user has default SSH configuration? ... yes
Active users: ... 1

Checking GitLab ... Finished

Results of GitLab application Check

same above?

Possible fixes

I've tried #35447 (closed) and #40898 (closed) but it not helped. I already cleaned the cookies too.