Basically do what it says in the configuration guide of PosBoxless, I understand that it worked, since the printer threw the ip address, but now it will not let me enter the web page.
Checking the services log shows that it can not load the web module and that it does not exist.

2017-05-04 21:25:38,148 3085 INFO ? odoo: Odoo version 10.0 2017-05-04 21:25:38,149 3085 INFO ? odoo: Using configuration file at /etc/odoo/odoo.conf 2017-05-04 21:25:38,149 3085 INFO ? odoo: addons paths: ['/opt/odoo/.local/share/Odoo/addons/10.0', u'/var/log/odoo/odoo-server.log', '/opt/odoo/server/odoo/addons']
2017-05-04 21:25:38,149 3085 INFO ? odoo: database: odoo@default:default 2017-05-04 21:25:38,149 3085 CRITICAL ? odoo.modules.module: Couldn't load module web 2017-05-04 21:25:38,149 3085 CRITICAL ? odoo.modules.module: No module named web 2017-05-04 21:25:38,149 3085 ERROR ? odoo.service.server: Failed to load server-wide module `web`.
The `web` module is provided by the addons found in the `openerp-web` project.
Maybe you forgot to add those addons in your addons_path configuration.
Traceback (most recent call last):
  File "/opt/odoo/server/odoo/service/server.py", line 842, in load_server_wide_modules
    odoo.modules.module.load_openerp_module(m)
  File "/opt/odoo/server/odoo/modules/module.py", line 367, in load_openerp_module
    __import__('odoo.addons.' + module_name)
  File "/opt/odoo/server/odoo/modules/module.py", line 60, in load_module
    f, path, (_suffix, _mode, type_) = imp.find_module(addon_name, ad_paths)
ImportError: No module named web 2017-05-04 21:25:38,150 3085 CRITICAL ? odoo.modules.module: Couldn't load module web_kanban 2017-05-04 21:25:38,150 3085 CRITICAL ? odoo.modules.module: No module named web_kanban 2017-05-04 21:25:38,150 3085 ERROR ? odoo.service.server: Failed to load server-wide module `web_kanban`.
Traceback (most recent call last):
  File "/opt/odoo/server/odoo/service/server.py", line 842, in load_server_wide_modules
    odoo.modules.module.load_openerp_module(m)
  File "/opt/odoo/server/odoo/modules/module.py", line 367, in load_openerp_module
    __import__('odoo.addons.' + module_name)
  File "/opt/odoo/server/odoo/modules/module.py", line 60, in load_module
    f, path, (_suffix, _mode, type_) = imp.find_module(addon_name, ad_paths)
ImportError: No module named web_kanban 2017-05-04 21:25:38,151 3085 INFO ? odoo.service.server: HTTP service (werkzeug) running on 0.0.0.0:8069