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On a lunar system with the same version of cheese installed in both deb and snap format:

$ snap list cheese
Name    Version  Rev  Tracking          Publisher     Notes
cheese  44.0     22   latest/candidate  ken-vandine✪  -

$ dpkg -l | grep cheese
ii  cheese                                     44.0-1                                                              amd64        tool to take pictures and videos from your webcam
ii  cheese-common                              44.0-1                                                              all          Common files for the Cheese tool to take pictures and videos
ii  libcheese-gtk25:amd64                      44.0-1                                                              amd64        tool to take pictures and videos from your webcam - widgets
ii  libcheese8:amd64                           44.0-1                                                              amd64        tool to take pictures and videos from your webcam - base library

We see the two different icons, when one would expect the icons to the the same since the cheese versions are the same. (The camera icon is for the deb, the smile icon is for the snap).

Also there are two desktop icons listed in the activities overview when the snap is installed, instead of one.

The cheese snap fails to connect to the webcam.

I have cheese from --candidate (Rev 22) installed on my lunar system with a webcam. When I run it, I see the light on my camera turn on but then off, with the following error message:

$ snap run cheese

(cheese:1724098): cheese-WARNING **: 11:39:44.702: Can't find vp8enc preset: "Profile Realtime", using alternate preset: "Cheese Realtime". If you see this, make a bug report!

(cheese:1724098): GStreamer-WARNING **: 11:39:44.702: gst_value_deserialize_g_value_array: unimplemented

(cheese:1724098): GStreamer-WARNING **: 11:39:44.702: gst_value_deserialize_g_value_array: unimplemented

(cheese:1724098): GStreamer-WARNING **: 11:39:44.702: gst_value_deserialize_g_value_array: unimplemented

(cheese:1724098): GStreamer-WARNING **: 11:39:44.713: gst_value_deserialize_g_value_array: unimplemented

(cheese:1724098): GStreamer-WARNING **: 11:39:44.713: gst_value_deserialize_g_value_array: unimplemented

(cheese:1724098): GStreamer-WARNING **: 11:39:44.713: gst_value_deserialize_g_value_array: unimplemented

(cheese:1724098): cheese-WARNING **: 11:39:46.651: Internal data stream error.: ../libs/gst/base/gstbasesrc.c(3127): gst_base_src_loop (): /GstCameraBin:camerabin/GstWrapperCameraBinSrc:camera_source/GstBin:bin18/GstV4l2Src:v4l2src1:
streaming stopped, reason error (-5)

It works until you press the video recording, then you get a black screen and you can not do anything except closing it. Taking pictures works.
Gtk-Message: 20:35:18.593: Not loading module "atk-bridge": The functionality is provided by GTK natively. Please try to not load it.

(cheese:36248): Gtk-WARNING **: 20:35:18.667: GTK+ module /snap/cheese/40/gnome-platform/usr/lib/gtk-2.0/modules/libcanberra-gtk-module.so cannot be loaded.
GTK+ 2.x symbols detected. Using GTK+ 2.x and GTK+ 3 in the same process is not supported.
Gtk-Message: 20:35:18.667: Failed to load module "canberra-gtk-module"

(cheese:36248): Gtk-WARNING **: 20:35:18.669: GTK+ module /snap/cheese/40/gnome-platform/usr/lib/gtk-2.0/modules/libcanberra-gtk-module.so cannot be loaded.
GTK+ 2.x symbols detected. Using GTK+ 2.x and GTK+ 3 in the same process is not supported.
Gtk-Message: 20:35:18.669: Failed to load module "canberra-gtk-module"

(cheese:36248): cheese-WARNING **: 20:35:19.157: Can't find vp8enc preset: "Profile Realtime", using alternate preset: "Cheese Realtime". If you see this, make a bug report!

(cheese:36248): GStreamer-WARNING **: 20:35:19.157: gst_value_deserialize_g_value_array: unimplemented

(cheese:36248): GStreamer-WARNING **: 20:35:19.157: gst_value_deserialize_g_value_array: unimplemented

(cheese:36248): GStreamer-WARNING **: 20:35:19.157: gst_value_deserialize_g_value_array: unimplemented

(cheese:36248): GStreamer-WARNING **: 20:35:19.175: gst_value_deserialize_g_value_array: unimplemented

(cheese:36248): GStreamer-WARNING **: 20:35:19.175: gst_value_deserialize_g_value_array: unimplemented

(cheese:36248): GStreamer-WARNING **: 20:35:19.175: gst_value_deserialize_g_value_array: unimplemented

(cheese:36248): cheese-WARNING **: 20:35:23.415: Failed to connect stream: Access denied: ../ext/pulse/pulsesrc.c(1622): gst_pulsesrc_prepare (): /GstCameraBin:camerabin/GstAutoAudioSrc:audiosrc/GstPulseSrc:audiosrc-actual-src-puls

(cheese:36248): cheese-WARNING **: 20:35:23.417: Internal data stream error.: ../libs/gst/base/gstbasesrc.c(3127): gst_base_src_loop (): /GstCameraBin:camerabin/GstAutoAudioSrc:audiosrc/GstPulseSrc:audiosrc-actual-src-puls:
streaming stopped, reason not-negotiated (-4)

Gtk-Message: 20:35:57.659: Not loading module "atk-bridge": The functionality is provided by GTK natively. Please try to not load it.