I am on Ubuntu 18.04.5 and here are some more info. Now I have seen some similar questions on the platform but no real solution. (cheese:5569): cheese-WARNING **: 08:55:13.752: Could not read from resource.: gstv4l2bufferpool.c(1040): gst_v4l2_buffer_pool_poll (): /GstCameraBin:camerabin/GstWrapperCameraBinSrc:camera_source/GstBin:bin19/GstV4l2Src:v4l2src2: ** (cheese:5569): CRITICAL **: 08:55:13.698: cheese_preferences_dialog_setup_resolutions_for_device: assertion 'device != NULL' failed (cheese:5569): GLib-GIO-CRITICAL **: 08:55:13.698: g_settings_set_value: key 'camera' in '' expects type 's', but a GVariant of type '(null)' was given (cheese:5569): GLib-GIO-CRITICAL **: 08:55:13.698: g_settings_schema_key_type_check: assertion 'value != NULL' failed (cheese:5569): cheese-CRITICAL **: 08:55:13.698: cheese_camera_device_get_name: assertion 'CHEESE_IS_CAMERA_DEVICE (device)' failed
** (cheese:5569): CRITICAL **: 08:55:11.981: cheese_preferences_dialog_setup_resolutions_for_device: assertion 'device != NULL' failed (cheese:5569): GLib-GIO-CRITICAL **: 08:55:11.981: g_settings_set_value: key 'camera' in '' expects type 's', but a GVariant of type '(null)' was given (cheese:5569): GLib-GIO-CRITICAL **: 08:55:11.980: g_settings_schema_key_type_check: assertion 'value != NULL' failed
(cheese:5569): cheese-CRITICAL **: 08:55:11.980: cheese_camera_device_get_name: assertion 'CHEESE_IS_CAMERA_DEVICE (device)' failed (cheese:5569): Gtk-WARNING **: 08:55:07.899: Theme parsing error: cheese.css:7:35: The style property GtkScrollbar:min-slider-length is deprecated and shouldn't be used anymore. Both of the commands throw the same error on the terminal and the window goes all black. Here is the error on calling cheese or sudo cheese. Any app/google meet says can't detect any webcam.