[Solved] After GitLab Mattermost install nothing but logo is shown

Troubleshooting
3
  1. I just uncomment the line with external_url
#####################
# GitLab Mattermost #
#####################

mattermost_external_url 'http://chat.mydomain.com'
#
# mattermost['enable'] = false
# mattermost['username'] = 'mattermost'
# mattermost['group'] = 'mattermost'
# mattermost['home'] = '/var/opt/gitlab/mattermost'
# mattermost['database_name'] = 'mattermost_production'

All other lines are commented

  1. The entire screenshot with incognito window