Copying the auth_oauth2 folder in Odoo's addons folder and attempting to install it from the main apps list on Odoo's frontend results in this error:

Odoo Server Error Traceback (most recent call last): File "/usr/lib/python3/dist-packages/odoo/http.py", line 624, in _handle_exception return super(JsonRequest, self)._handle_exception(exception) File "/usr/lib/python3/dist-packages/odoo/http.py", line 310, in _handle_exception raise pycompat.reraise(type(exception), exception, sys.exc_info()[2]) File "/usr/lib/python3/dist-packages/odoo/tools/pycompat.py", line 14, in reraise raise value File "/usr/lib/python3/dist-packages/odoo/http.py", line 669, in dispatch result = self._call_function(**self.params) File "/usr/lib/python3/dist-packages/odoo/http.py", line 350, in _call_function return checked_call(self.db, *args, **kwargs) File "/usr/lib/python3/dist-packages/odoo/service/model.py", line 94, in wrapper return f(dbname, *args, **kwargs) File "/usr/lib/python3/dist-packages/odoo/http.py", line 339, in checked_call result = self.endpoint(*a, **kw) File "/usr/lib/python3/dist-packages/odoo/http.py", line 915, in __call__ return self.method(*args, **kw) File "/usr/lib/python3/dist-packages/odoo/http.py", line 515, in response_wrap response = f(*args, **kw) File "/usr/lib/python3/dist-packages/odoo/addons/web/controllers/main.py", line 1326, in call_button action = self._call_kw(model, method, args, kwargs) File "/usr/lib/python3/dist-packages/odoo/addons/web/controllers/main.py", line 1314, in _call_kw return call_kw(request.env[model], method, args, kwargs) File "/usr/lib/python3/dist-packages/odoo/api.py", line 387, in call_kw result = _call_kw_multi(method, model, args, kwargs) File "/usr/lib/python3/dist-packages/odoo/api.py", line 374, in _call_kw_multi result = method(recs, *args, **kwargs) File "<decorator-gen-59>", line 2, in button_immediate_install File "/usr/lib/python3/dist-packages/odoo/addons/base/models/ir_module.py", line 72, in check_and_log return method(self, *args, **kwargs) File "/usr/lib/python3/dist-packages/odoo/addons/base/models/ir_module.py", line 463, in button_immediate_install return self._button_immediate_function(type(self).button_install) File "/usr/lib/python3/dist-packages/odoo/addons/base/models/ir_module.py", line 573, in _button_immediate_function modules.registry.Registry.new(self._cr.dbname, update_module=True) File "/usr/lib/python3/dist-packages/odoo/modules/registry.py", line 86, in new odoo.modules.load_modules(registry._db, force_demo, status, update_module) File "/usr/lib/python3/dist-packages/odoo/modules/loading.py", line 423, in load_modules loaded_modules, update_module, models_to_check) File "/usr/lib/python3/dist-packages/odoo/modules/loading.py", line 315, in load_marked_modules perform_checks=perform_checks, models_to_check=models_to_check File "/usr/lib/python3/dist-packages/odoo/modules/loading.py", line 182, in load_module_graph load_openerp_module(package.name) File "/usr/lib/python3/dist-packages/odoo/modules/module.py", line 376, in load_openerp_module __import__('odoo.addons.' + module_name) File "/usr/lib/python3/dist-packages/odoo/addons/auth_oauth2/__init__.py", line 2, in <module> from . import controlers File "/usr/lib/python3/dist-packages/odoo/addons/auth_oauth2/controlers/__init__.py", line 2, in <module> from . import main File "/usr/lib/python3/dist-packages/odoo/addons/auth_oauth2/controlers/main.py", line 5, in <module> import openerp.addons.web.ir_http as openerpweb File "/usr/lib/python3/dist-packages/odoo/modules/module.py", line 95, in load_module mod = importlib.import_module(canonical) File "/usr/lib/python3.7/importlib/__init__.py", line 127, in import_module return _bootstrap._gcd_import(name[level:], package, level) ModuleNotFoundError: No module named 'odoo.addons.web.ir_http'

This happens with Odoo 13.0.20200722, on Debian 10.

Any help would be greatly appreciated.

This is not a common case but this is pretty annoying when you meet it. When you use the #login,password signin way it causes a little bug if the user you're trying to connect with is from a group which has only one allowed menu to see.

Menu's items and view are not loaded, you have to get rid of the '#login,password' part of the url after the success of the connection to finally show the view.