Quick start with foreman-installer not working on fresh Ubuntu 18.04 VM

Problem:
Following the quick start from Foreman :: Manual for Ubuntu 18.04 fails with the following error:
Could not evaluate: Proxy foreman2.example.com cannot be retrieved: unknown error (response 401)

Expected outcome:
Successful install

Foreman and Proxy versions:
2.0 / ?

Foreman and Proxy plugin versions:
n/a

Distribution and version:
Distributor ID: Ubuntu
Description: Ubuntu 18.04.4 LTS
Release: 18.04
Codename: bionic

Minimal VM install

Other relevant data:
Installer has been run as root user, logs (domain has been redacted):

[DEBUG 2020-05-31T14:56:02 main] Exit with status code: 4 (signal was 4)
[ERROR 2020-05-31T14:56:02 main] Errors encountered during run:
[ERROR 2020-05-31T14:56:02 main]  /Stage[main]/Foreman_proxy::Register/Foreman_smartproxy[foreman2.example.com]: Could not evaluate: Proxy foreman2.example.com cannot be retrieved: unknown error (response 401)
[ERROR 2020-05-31T14:56:02 main] /usr/share/foreman-installer/modules/foreman/lib/puppet/provider/foreman_smartproxy/rest_v3.rb:7:in `proxy'
[ERROR 2020-05-31T14:56:02 main] /usr/share/foreman-installer/modules/foreman/lib/puppet/provider/foreman_smartproxy/rest_v3.rb:13:in `id'
[ERROR 2020-05-31T14:56:02 main] /usr/share/foreman-installer/modules/foreman/lib/puppet/provider/foreman_smartproxy/rest_v3.rb:17:in `exists?'
[ERROR 2020-05-31T14:56:02 main] /opt/puppetlabs/puppet/lib/ruby/vendor_ruby/puppet/property/ensure.rb:82:in `retrieve'
[ERROR 2020-05-31T14:56:02 main] /opt/puppetlabs/puppet/lib/ruby/vendor_ruby/puppet/type.rb:1111:in `retrieve'
[ERROR 2020-05-31T14:56:02 main] /opt/puppetlabs/puppet/lib/ruby/vendor_ruby/puppet/type.rb:1139:in `retrieve_resource'
[ERROR 2020-05-31T14:56:02 main] /opt/puppetlabs/puppet/lib/ruby/vendor_ruby/puppet/transaction/resource_harness.rb:307:in `from_resource'
[ERROR 2020-05-31T14:56:02 main] /opt/puppetlabs/puppet/lib/ruby/vendor_ruby/puppet/transaction/resource_harness.rb:20:in `evaluate'
[ERROR 2020-05-31T14:56:02 main] /opt/puppetlabs/puppet/lib/ruby/vendor_ruby/puppet/transaction.rb:267:in `apply'
[ERROR 2020-05-31T14:56:02 main] /opt/puppetlabs/puppet/lib/ruby/vendor_ruby/puppet/transaction.rb:287:in `eval_resource'
[ERROR 2020-05-31T14:56:02 main] /opt/puppetlabs/puppet/lib/ruby/vendor_ruby/puppet/transaction.rb:191:in `call'
[ERROR 2020-05-31T14:56:02 main] /opt/puppetlabs/puppet/lib/ruby/vendor_ruby/puppet/transaction.rb:191:in `block (2 levels) in evaluate'
[ERROR 2020-05-31T14:56:02 main] /opt/puppetlabs/puppet/lib/ruby/vendor_ruby/puppet/util.rb:521:in `block in thinmark'
[ERROR 2020-05-31T14:56:02 main] /opt/puppetlabs/puppet/lib/ruby/2.5.0/benchmark.rb:308:in `realtime'
[ERROR 2020-05-31T14:56:02 main] /opt/puppetlabs/puppet/lib/ruby/vendor_ruby/puppet/util.rb:520:in `thinmark'
[ERROR 2020-05-31T14:56:02 main] /opt/puppetlabs/puppet/lib/ruby/vendor_ruby/puppet/transaction.rb:191:in `block in evaluate'
[ERROR 2020-05-31T14:56:02 main] /opt/puppetlabs/puppet/lib/ruby/vendor_ruby/puppet/graph/relationship_graph.rb:122:in `traverse'
[ERROR 2020-05-31T14:56:02 main] /opt/puppetlabs/puppet/lib/ruby/vendor_ruby/puppet/transaction.rb:178:in `evaluate'
[ERROR 2020-05-31T14:56:02 main] /opt/puppetlabs/puppet/lib/ruby/vendor_ruby/puppet/resource/catalog.rb:240:in `block (2 levels) in apply'
[ERROR 2020-05-31T14:56:02 main] /opt/puppetlabs/puppet/lib/ruby/vendor_ruby/puppet/util.rb:521:in `block in thinmark'
[ERROR 2020-05-31T14:56:02 main] /opt/puppetlabs/puppet/lib/ruby/2.5.0/benchmark.rb:308:in `realtime'
[ERROR 2020-05-31T14:56:02 main] /opt/puppetlabs/puppet/lib/ruby/vendor_ruby/puppet/util.rb:520:in `thinmark'
[ERROR 2020-05-31T14:56:02 main] /opt/puppetlabs/puppet/lib/ruby/vendor_ruby/puppet/resource/catalog.rb:239:in `block in apply'
[ERROR 2020-05-31T14:56:02 main] /opt/puppetlabs/puppet/lib/ruby/vendor_ruby/puppet/util/log.rb:161:in `with_destination'
[ERROR 2020-05-31T14:56:02 main] /opt/puppetlabs/puppet/lib/ruby/vendor_ruby/puppet/transaction/report.rb:146:in `as_logging_destination'
[ERROR 2020-05-31T14:56:02 main] /opt/puppetlabs/puppet/lib/ruby/vendor_ruby/puppet/resource/catalog.rb:238:in `apply'
[ERROR 2020-05-31T14:56:02 main] /opt/puppetlabs/puppet/lib/ruby/vendor_ruby/puppet/configurer.rb:185:in `block (2 levels) in apply_catalog'
[ERROR 2020-05-31T14:56:02 main] /opt/puppetlabs/puppet/lib/ruby/vendor_ruby/puppet/util.rb:521:in `block in thinmark'
[ERROR 2020-05-31T14:56:02 main] /opt/puppetlabs/puppet/lib/ruby/2.5.0/benchmark.rb:308:in `realtime'
[ERROR 2020-05-31T14:56:02 main] /opt/puppetlabs/puppet/lib/ruby/vendor_ruby/puppet/util.rb:520:in `thinmark'
[ERROR 2020-05-31T14:56:02 main] /opt/puppetlabs/puppet/lib/ruby/vendor_ruby/puppet/configurer.rb:184:in `block in apply_catalog'
[ERROR 2020-05-31T14:56:02 main] /opt/puppetlabs/puppet/lib/ruby/vendor_ruby/puppet/util.rb:233:in `block in benchmark'
[ERROR 2020-05-31T14:56:02 main] /opt/puppetlabs/puppet/lib/ruby/2.5.0/benchmark.rb:308:in `realtime'
[ERROR 2020-05-31T14:56:02 main] /opt/puppetlabs/puppet/lib/ruby/vendor_ruby/puppet/util.rb:232:in `benchmark'
[ERROR 2020-05-31T14:56:02 main] /opt/puppetlabs/puppet/lib/ruby/vendor_ruby/puppet/configurer.rb:183:in `apply_catalog'
[ERROR 2020-05-31T14:56:02 main] /opt/puppetlabs/puppet/lib/ruby/vendor_ruby/puppet/configurer.rb:391:in `run_internal'
[ERROR 2020-05-31T14:56:02 main] /opt/puppetlabs/puppet/lib/ruby/vendor_ruby/puppet/configurer.rb:227:in `block in run'
[ERROR 2020-05-31T14:56:02 main] /opt/puppetlabs/puppet/lib/ruby/vendor_ruby/puppet/context.rb:62:in `override'
[ERROR 2020-05-31T14:56:02 main] /opt/puppetlabs/puppet/lib/ruby/vendor_ruby/puppet.rb:290:in `override'
[ERROR 2020-05-31T14:56:02 main] /opt/puppetlabs/puppet/lib/ruby/vendor_ruby/puppet/configurer.rb:210:in `run'
[ERROR 2020-05-31T14:56:02 main] /opt/puppetlabs/puppet/lib/ruby/vendor_ruby/puppet/application/apply.rb:343:in `apply_catalog'
[ERROR 2020-05-31T14:56:02 main] /opt/puppetlabs/puppet/lib/ruby/vendor_ruby/puppet/application/apply.rb:260:in `block (2 levels) in main'
[ERROR 2020-05-31T14:56:02 main] /opt/puppetlabs/puppet/lib/ruby/vendor_ruby/puppet/context.rb:62:in `override'
[ERROR 2020-05-31T14:56:02 main] /opt/puppetlabs/puppet/lib/ruby/vendor_ruby/puppet.rb:290:in `override'
[ERROR 2020-05-31T14:56:02 main] /opt/puppetlabs/puppet/lib/ruby/vendor_ruby/puppet/application/apply.rb:243:in `block in main'
[ERROR 2020-05-31T14:56:02 main] /opt/puppetlabs/puppet/lib/ruby/vendor_ruby/puppet/context.rb:62:in `override'
[ERROR 2020-05-31T14:56:02 main] /opt/puppetlabs/puppet/lib/ruby/vendor_ruby/puppet.rb:290:in `override'
[ERROR 2020-05-31T14:56:02 main] /opt/puppetlabs/puppet/lib/ruby/vendor_ruby/puppet/application/apply.rb:207:in `main'
[ERROR 2020-05-31T14:56:02 main] /opt/puppetlabs/puppet/lib/ruby/vendor_ruby/puppet/application/apply.rb:177:in `run_command'
[ERROR 2020-05-31T14:56:02 main] /opt/puppetlabs/puppet/lib/ruby/vendor_ruby/puppet/application.rb:382:in `block in run'
[ERROR 2020-05-31T14:56:02 main] /opt/puppetlabs/puppet/lib/ruby/vendor_ruby/puppet/util.rb:710:in `exit_on_fail'
[ERROR 2020-05-31T14:56:02 main] /opt/puppetlabs/puppet/lib/ruby/vendor_ruby/puppet/application.rb:382:in `run'
[ERROR 2020-05-31T14:56:02 main] /opt/puppetlabs/puppet/lib/ruby/vendor_ruby/puppet/util/command_line.rb:143:in `run'
[ERROR 2020-05-31T14:56:02 main] /opt/puppetlabs/puppet/lib/ruby/vendor_ruby/puppet/util/command_line.rb:77:in `execute'
[ERROR 2020-05-31T14:56:02 main] /opt/puppetlabs/puppet/bin/puppet:5:in `<main>'
[DEBUG 2020-05-31T14:56:02 main] Cleaning /tmp/kafo_installation20200531-27101-9kaipl
[DEBUG 2020-05-31T14:56:02 main] Cleaning /tmp/kafo_installation20200531-27101-y576vb
[DEBUG 2020-05-31T14:56:02 main] Cleaning /tmp/default_values.yaml
[ INFO 2020-05-31T14:56:02 main] Installer finished in 30.666546002 seconds

Tried again, this time as a normal user using sudo and it ran through

We’ve seen this in our CI every now and then, but it’s been hard to reproduce. Is there anything special in /var/log/foreman/production.log?