I have tried reinstalling and uninstalling but each time uninstall gives the following exception.
After the uninstall attempt and exception it seems the module is removed as drupal thinks it is uninstalled and allows reinstall, however the admin navigation still exists although attempting to go to any of the pages gives an exception. Curiously the /admin/group/settings page still loads. Functionality returns when reinstalled.
This was installed some time ago (maybe 6 - 9 months) but has been periodically updated and is now at rc1, so it could be a left over issue from beta or pre-beta release?
Drupal\Component\Plugin\Exception\PluginNotFoundException: The "group_permission" plugin does not exist. in Drupal\Core\Plugin\DefaultPluginManager->doGetDefinition() (line 52 of core/lib/Drupal/Component/Plugin/Discovery/DiscoveryTrait.php).
Drupal\Core\Plugin\DefaultPluginManager->getDefinition('group_permission') (Line: 16)
Drupal\Core\Plugin\Factory\ContainerFactory->createInstance('group_permission', Array) (Line: 84)
Drupal\Component\Plugin\PluginManagerBase->createInstance('group_permission') (Line: 810)
Drupal\views\Plugin\views\display\DisplayPluginBase->getPlugin('access') (Line: 194)
Drupal\views\Plugin\views\display\PathPluginBase->getRoute('group_nodes', 'page_1') (Line: 220)
Drupal\views\Plugin\views\display\PathPluginBase->collectRoutes(Object) (Line: 120)
Drupal\views\EventSubscriber\RouteSubscriber->routes()
call_user_func(Array) (Line: 146)
Drupal\Core\Routing\RouteBuilder->rebuild() (Line: 83)
Drupal\Core\ProxyClass\Routing\RouteBuilder->rebuild() (Line: 473)
Drupal\Core\Extension\ModuleInstaller->uninstall(Array, 1) (Line: 91)
Drupal\Core\ProxyClass\Extension\ModuleInstaller->uninstall(Array) (Line: 160)
Drupal\system\Form\ModulesUninstallConfirmForm->submitForm(Array, Object)
call_user_func_array(Array, Array) (Line: 111)
Drupal\Core\Form\FormSubmitter->executeSubmitHandlers(Array, Object) (Line: 51)
Drupal\Core\Form\FormSubmitter->doSubmitForm(Array, Object) (Line: 585)
Drupal\Core\Form\FormBuilder->processForm('system_modules_uninstall_confirm_form', Array, Object) (Line: 314)
Drupal\Core\Form\FormBuilder->buildForm(Object, Object) (Line: 74)
Drupal\Core\Controller\FormController->getContentResult(Object, Object)
call_user_func_array(Array, Array) (Line: 123)
Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() (Line: 574)
Drupal\Core\Render\Renderer->executeInRenderContext(Object, Object) (Line: 124)
Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->wrapControllerExecutionInRenderContext(Array, Array) (Line: 97)
Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}()
call_user_func_array(Object, Array) (Line: 144)
Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object, 1) (Line: 64)
Symfony\Component\HttpKernel\HttpKernel->handle(Object, 1, 1) (Line: 57)
Drupal\Core\StackMiddleware\Session->handle(Object, 1, 1) (Line: 47)
Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object, 1, 1) (Line: 99)
Drupal\page_cache\StackMiddleware\PageCache->pass(Object, 1, 1) (Line: 78)
Drupal\page_cache\StackMiddleware\PageCache->handle(Object, 1, 1) (Line: 47)
Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object, 1, 1) (Line: 50)
Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object, 1, 1) (Line: 23)
Stack\StackedHttpKernel->handle(Object, 1, 1) (Line: 656)
Drupal\Core\DrupalKernel->handle(Object) (Line: 19)
Closed: works as designed
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
Just commenting I finally got around to removing group v 2.2.2 from a site, and this was the last step. I had to reinstall group, manually delete these two views (group nodes, group members), then uninstall and remove the module again, and everything looks good.