Hello,

we are new at odoo.
We have bought odoo 18 enterprise and setup a fresh installation with a fresh database.
After installation of the website app, we can do the first setup, but after this we get the following error:

Traceback (most recent call last):
  File "<5799>", line 1675, in template_5799
  File "<5799>", line 1213, in template_5799_content
  File "/usr/lib/python3/dist-packages/odoo/addons/base/models/ir_qweb.py", line 2524, in _load_values
    return get_value()
           ^^^^^^^^^^^
  File "<5799>", line 1203, in template_5799_t_cache_0_cache
  File "<5799>", line 476, in template_5799_t_cache_0
  File "/usr/lib/python3/dist-packages/odoo/addons/website/models/website.py", line 1698, in _is_canonical_url
    current_url = request.httprequest.url_root[:-1] + request.httprequest.environ['REQUEST_URI']
                                                      ~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^
KeyError: 'REQUEST_URI'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/odoo/http.py", line 1954, in _transactioning
    return service_model.retrying(func, env=self.env)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/odoo/service/model.py", line 137, in retrying
    result = func()
             ^^^^^^
  File "/usr/lib/python3/dist-packages/odoo/http.py", line 1921, in _serve_ir_http
    response = self.dispatcher.dispatch(rule.endpoint, args)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/odoo/http.py", line 2081, in dispatch
    return self.request.registry['ir.http']._dispatch(endpoint)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/odoo/addons/base/models/ir_http.py", line 331, in _dispatch
    result.flatten()
  File "/usr/lib/python3/dist-packages/odoo/http.py", line 1388, in flatten
    self.response.append(self.render())
                         ^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/odoo/http.py", line 1380, in render
    return request.env["ir.ui.view"]._render_template(self.template, self.qcontext)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/odoo/addons/website/models/ir_ui_view.py", line 449, in _render_template
    return super()._render_template(template, values=values)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/odoo/addons/base/models/ir_ui_view.py", line 2187, in _render_template
    return self.env['ir.qweb']._render(template, values)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/odoo/tools/profiler.py", line 306, in _tracked_method_render
    return method_render(self, template, values, **options)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/odoo/addons/base/models/ir_qweb.py", line 600, in _render
    result = ''.join(rendering)
             ^^^^^^^^^^^^^^^^^^
  File "<5797>", line 39, in template_5797
  File "<5797>", line 28, in template_5797_content
  File "<5799>", line 1683, in template_5799
odoo.addons.base.models.ir_qweb.QWebException: Error while render the template
KeyError: 'REQUEST_URI'
Template: website.layout
Path: /t/html/head/t[10]/t
Node: <t t-foreach="frontend_languages.values()" t-as="lg"/>

Maybe someone can help?
I have already tried to "reset to initial version (hard reset)" of the template, but this does not work.

Also reinstallation/upgrade of the app does not work.

Thanks!