This can be fixed when a user runs a rake task 

rake db:sequences:reset

https://github.com/theforeman/foreman/pull/1337

I think went data is migrated to a database using COPY rather than INSERT, then the sequence is not updated.

Moving back to ASSIGNED as the rake task does not solve the issue, nor is the fix actually committed to the internal repo.

*** Bug 1082581 has been marked as a duplicate of this bug. ***

Moving to POST since upstream bug http://projects.theforeman.org/issues/4731 has been closed

Verified:

1. Gone to Configure > Environments
2. Clicked on New Puppet Environment
3. Entered a unique name as "unique_5859598563525652"
4. Clicked on "Submit"
5. The puppet environments list is showed

Log when doing the create request:

# tail -f /var/log/{katello,pulp,candlepin,foreman*,headpin,thumbslug,signo,tomcat6}/{*.log,*.out}
Processing by EnvironmentsController#create as */*
  Parameters: {"utf8"=>"✓", "search"=>"", "authenticity_token"=>"509Y7NxFVNnJau9svXvTWFaW9lXn3hSl0/AH0GctkvA=", "environment"=>{"name"=>"unique_5859598563525653", "location_ids"=>[""], "organization_ids"=>[""]}}
Redirected to https://qetello02.usersys.redhat.com/environments
Completed 302 Found in 22ms (ActiveRecord: 10.0ms)
Processing by EnvironmentsController#index as */*
  Rendered environments/index.html.erb within layouts/application (274.4ms)
  Rendered common/_searchbar.html.erb (3.1ms)
  Rendered home/_submenu.html.erb (4.7ms)
  Rendered home/_user_dropdown.html.erb (1.6ms)
Read fragment views/tabs_and_title_records-1 (0.2ms)
  Rendered home/_topbar.html.erb (8.2ms)
  Rendered layouts/base.html.erb (9.9ms)
Completed 200 OK in 301ms (Views: 288.3ms | ActiveRecord: 2.8ms)

Environment:

# for i in `rpm -qa | grep -iE "^rubygem-hammer|^katello|^pulp|^candlepin|^foreman|^headpin|^thumbslug|^elasticsearch|ldap|signo|ruby193-rubygem-runcible" | sort`; do echo "* $i"; do
* apr-util-ldap-1.3.9-3.el6_0.1.x86_64
* candlepin-0.9.7-1.el6_5.noarch
* candlepin-scl-1-5.el6_4.noarch
* candlepin-scl-quartz-2.1.5-5.el6_4.noarch
* candlepin-scl-rhino-1.7R3-1.el6_4.noarch
* candlepin-scl-runtime-1-5.el6_4.noarch
* candlepin-selinux-0.9.7-1.el6_5.noarch
* candlepin-tomcat6-0.9.7-1.el6_5.noarch
* elasticsearch-0.90.10-4.el6sat.noarch
* foreman-1.6.0.7-1.el6sat.noarch
* foreman-compute-1.6.0.7-1.el6sat.noarch
* foreman-gce-1.6.0.7-1.el6sat.noarch
* foreman-libvirt-1.6.0.7-1.el6sat.noarch
* foreman-ovirt-1.6.0.7-1.el6sat.noarch
* foreman-postgresql-1.6.0.7-1.el6sat.noarch
* foreman-proxy-1.6.0.4-1.el6sat.noarch
* foreman-selinux-1.5.0-0.develop.el6sat.noarch
* foreman-vmware-1.6.0.7-1.el6sat.noarch
* katello-1.5.0-22.el6sat.noarch
* katello-ca-1.0-1.noarch
* katello-certs-tools-1.5.5-1.el6sat.noarch
* katello-installer-0.0.37-1.el6sat.noarch
* openldap-2.4.23-31.el6.x86_64
* pulp-katello-plugins-0.2-1.el6sat.noarch
* pulp-nodes-common-2.3.1-0.4.beta.el6sat.noarch
* pulp-nodes-parent-2.3.1-0.4.beta.el6sat.noarch
* pulp-puppet-plugins-2.3.1-0.4.beta.el6sat.noarch
* pulp-rpm-plugins-2.3.1-0.4.beta.el6sat.noarch
* pulp-selinux-2.3.1-0.4.beta.el6sat.noarch
* pulp-server-2.3.1-0.4.beta.el6sat.noarch
* python-ldap-2.3.10-1.el6.x86_64
* ruby193-rubygem-ldap_fluff-0.2.2-2.el6sat.noarch
* ruby193-rubygem-net-ldap-0.3.1-3.el6sat.noarch
* ruby193-rubygem-runcible-1.0.8-1.el6sat.noarch
* rubygem-hammer_cli-0.1.0-12.el6sat.noarch
* rubygem-hammer_cli_foreman-0.1.0-12.el6sat.noarch
* rubygem-hammer_cli_foreman_tasks-0.0.2-5.el6sat.noarch
* rubygem-hammer_cli_katello-0.0.3-22.el6sat.noarch

This was delivered with 6.0.3, which is the Satellite 6 Beta.

This was delivered in 6.0.3, the Beta version of Satellite 6.0